Ketil Størdal

• Kurppa, Kalle; Mulder, Chris J.; Størdal, Ketil & Kaukinen, Katri (2024). Celiac Disease Affects 1% of Global Population—Who Will Manage All These Patients? What Are Criteria to Prioritize Along Risk for Complications? Gastroenterology. ISSN 0016-5085. doi: 10.1053/j.gastro.2023.12.026.
• Lerchova, Tereza; Størdal, Ketil; Andersson, Björn; Ludvigsson, Johnny & Mårild, Karl Staffan (2024). Atopic Dermatitis in Early Childhood and Risk of Inflammatory Bowel Disease: A Scandinavian Birth Cohort Study. Journal of Pediatrics. ISSN 0022-3476. 270. doi: 10.1016/j.jpeds.2024.114027.
• Lund-Blix, Nicolai Andre; Bjerregaard, Anne A.; Tapia, German; Størdal, Ketil; Brantsæter, Anne Lise & Strøm, Marin [Show all 14 contributors for this article] (2024). No association between long-chain n-3 fatty acid intake during pregnancy and risk of type 1 diabetes in offspring in two large Scandinavian pregnancy cohorts. Diabetologia. ISSN 0012-186X. doi: 10.1007/s00125-024-06125-4.
• Larsen, Johanne Hartwedt; Andersen, Svend; Perminow, Gøri Margrete; Mundal, Håkon Stangeland; Mårild, Karl Staffan & Stabell, Niklas [Show all 7 contributors for this article] (2024). Higher incidence of paediatric inflammatory bowel disease by increasing latitude in Norway, but stable incidence by age. Acta Paediatrica. ISSN 0803-5253. doi: 10.1111/apa.17222.
• Jankauskaite, Lina; Wyder, Corinne; del Torso, Stefano; Mamenko, Marina; Trapani, Sandra & Grossman, Zachi [Show all 15 contributors for this article] (2024). Over-investigation and overtreatment in pediatrics: a survey from the European Academy of Paediatrics and Japan Pediatric Society. Frontiers in pediatrics. ISSN 2296-2360. 12. doi: 10.3389/fped.2024.1333239.
• Bøås, Håkon; Havdal, Lise Beier; Størdal, Ketil; Døllner, Henrik; Leegaard, Truls Michael & Bekkevold, Terese [Show all 14 contributors for this article] (2024). No association between disease severity and respiratory syncytial virus subtypes RSV-A and RSV-B in hospitalized young children in Norway. PLOS ONE. ISSN 1932-6203. 19(3). doi: 10.1371/journal.pone.0298104. Full text in Research Archive
• Guo, Annie; Ludvigsson, Johnny; Brantsæter, Anne Lise; Klingberg, Sofia; Östensson, Malin & Størdal, Ketil [Show all 7 contributors for this article] (2024). Early-life diet and risk of inflammatory bowel disease: A pooled study in two Scandinavian birth cohorts. Gut. ISSN 0017-5749. doi: 10.1136/gutjnl-2023-330971.
• Sahli, Sarah & Størdal, Ketil (2024). Systematic review of socioeconomic factors and COVID-19 in children and adolescents. Acta Paediatrica. ISSN 0803-5253. doi: 10.1111/apa.17091.
• Bøås, Håkon; Storm, Margrethe Larsdatter; Tapia, German; Kristoffersen, Anja Bråthen; Løvlie, Astrid Louise & Størdal, Ketil [Show all 10 contributors for this article] (2024). Frequency and risk of SARS-CoV-2 reinfections in Norway: a nation-wide study, February 2020 to January 2022. BMC Public Health. ISSN 1471-2458. 24(1), p. 1–13. doi: 10.1186/s12889-024-17695-8. Full text in Research Archive
• Størdal, Ketil; Tapia, German; Lund-Blix, Nicolai Andre & Stene, Lars Christian Mørch (2023). Genotypes predisposing for celiac disease and autoimmune diabetes and risk of infections in early childhood. Journal of Pediatric Gastroenterology and Nutrition - JPGN. ISSN 0277-2116. 78(2), p. 295–303. doi: 10.1002/jpn3.12078. Full text in Research Archive
• Sigvardsson, Ida; Størdal, Ketil; Östensson, Malin; Guo, Annie; Ludvigsson, Johnny & Mårild, Karl (2023). Childhood Socioeconomic Characteristics and Risk of Inflammatory Bowel Disease: A Scandinavian Birth Cohort Study. Inflammatory Bowel Diseases. ISSN 1078-0998. XX, p. 1–11. doi: 10.1093/ibd/izad220. Full text in Research Archive
• Landaas, Vibeke Østberg; Skjerven, Håvard Ove; Carlsen, Karin Cecilie Lødrup; Størdal, Ketil & Håland, Geir (2023). Home-Based Double-Blind, Placebo-Controlled Challenges for Diagnosis of Delayed Gluten/Milk Hypersensitivity in Children. Journal of Allergy and Clinical Immunology: In Practice. ISSN 2213-2198. 12(3), p. 652–659. doi: 10.1016/j.jaip.2023.12.032.
• Guo, Annie; Östensson, Malin; Størdal, Ketil; Ludvigsson, Johnny & Mårild, Karl (2023). Early-Life Hygiene-Related Factors and Risk of Inflammatory Bowel Disease: A Scandinavian Birth Cohort Study. Inflammatory Bowel Diseases. ISSN 1078-0998. XX, p. 1–11. doi: 10.1093/ibd/izad257. Full text in Research Archive
• Rydland, Eva; Høye, Sigurd & Størdal, Ketil (2023). Antibiotic use for airway infections in Norwegian children—A national register-based study. Acta Paediatrica. ISSN 0803-5253. 113(3), p. 537–543. doi: 10.1111/apa.17052. Full text in Research Archive
• Ulnes, Maria; Albrektsson, Henrik; Størdal, Ketil; Saalman, Robert; Ludvigsson, Jonas F. & Mårild, Karl Staffan (2023). Lack of Follow-Up for Celiac Disease During Childhood Not Associated With Poor Health Outcomes: A Regional Swedish Cohort Study. Journal of Pediatric Gastroenterology and Nutrition - JPGN. ISSN 0277-2116. 77(5), p. 640–647. doi: 10.1097/MPG.0000000000003911. Full text in Research Archive
• Rossholt, Madelaine; Bratlie, Marianne; Wendel, Kristina; Aas, Marlen Fossan; Gunnarsdottir, Gunnþórunn & Fugelseth, Drude [Show all 11 contributors for this article] (2023). Effect of arachidonic and docosahexaenoic acid supplementation on quality of growth in preterm infants: A secondary analysis of a randomized controlled trial. Clinical Nutrition. ISSN 0261-5614. 42(12), p. 2311–2319. doi: 10.1016/j.clnu.2023.10.005. Full text in Research Archive
• Lerchova, Tereza; Östensson, Malin; Sigvardsson, Ida; Størdal, Ketil; Guo, Annie & Mårild, Karl Staffan [Show all 7 contributors for this article] (2023). Physical activity in childhood and later risk of inflammatory bowel disease: A Scandinavian birth cohort study. United European Gastroenterology Journal (UEG Journal). ISSN 2050-6406. 11(9), p. 874–883. doi: 10.1002/ueg2.12469. Full text in Research Archive
• Larsen, Vilde Bergstad; Størdal, Ketil; Telle, Kjetil Elias; Methi, Fredrik & Magnusson, Karin (2023). Health care use after severe respiratory tract infections in children aged 0 to 5 years. Scandinavian Journal of Public Health. ISSN 1403-4948. doi: 10.1177/14034948231197250. Full text in Research Archive
• Hestetun, Sigrid Valen; Andersen, Svend; Sanner, Helga & Størdal, Ketil (2023). Antibiotic exposure in prenatal and early life and risk of juvenile idiopathic arthritis: a nationwide register-based cohort study. RMD Open. ISSN 2056-5933. 9(3), p. 1–8. doi: 10.1136/rmdopen-2023-003333. Full text in Research Archive Show summary

  Objectives Early antibiotic exposure influences the gut microbiota which is believed to be involved in the pathogenesis of juvenile idiopathic arthritis (JIA). We aimed to investigate the association between systemic antibiotics in prenatal and early life and risk of JIA. Methods We conducted a register-based cohort study including all children born in Norway from 2004 through 2012. The children were followed until 31 December 2020. Main exposures were dispensed antibiotics to the mother during pregnancy and to the child during 0–24 months of age. The outcome was defined by diagnostic codes indicating JIA. Multivariate logistic regression analyses were performed to estimate the association between antibiotic exposure and JIA. Results We included 535 294 children and their mothers in the analyses; 1011 cases were identified. We found an association between exposure to systemic antibiotics during 0–24 months and JIA (adjusted OR (aOR) 1.40, 95% CI 1.24 to 1.59), with a stronger association for >1 course (aOR 1.50, 95% CI 1.29 to 1.74) vs 1 course (aOR 1.31, 95% CI 1.13 to 1.53). Subanalyses showed significant associations in all age periods except 0–6 months, and stronger association with sulfonamides/trimethoprim and broad-spectrum antibiotics. There was no association between prenatal antibiotic exposure and JIA. Conclusions The novel observation of no association with prenatal antibiotic exposure and JIA suggests that the association between antibiotics in early life and JIA is unlikely to be confounded by shared family factors. This may indicate that exposure to antibiotics in early life is an independent risk factor for JIA.

• Jansen, Danielle; Brenner, Maria; Illy, Károly; Dembiński, Łukasz; del Torso, Stefano & Grossman, Zachi [Show all 13 contributors for this article] (2023). Leave no one behind: why WHO's regional office for Europe should prioritise children and adolescents in their program of work. A position statement from the European academy of paediatrics. Frontiers in pediatrics. ISSN 2296-2360. 11. doi: 10.3389/fped.2023.1184870. Full text in Research Archive
• Closs, Emilie Raaum; Lyamouri, Miriam; Øymar, Knut Asbjørn Alexander & Størdal, Ketil (2023). Regionale forskjeller i bruk av protonpumpehemmere hos barn. Tidsskrift for Den norske legeforening. ISSN 0029-2001. 143(9), p. 782–787. doi: 10.4045/tidsskr.22.0771. Full text in Research Archive
• Östensson, Malin; Björkqvist, Olle; Guo, Annie; Størdal, Ketil; Halfvarson, Jonas & Mårild, Karl [Show all 7 contributors for this article] (2023). Epidemiology, validation, and clinical characteristics of inflammatory bowel disease: the ABIS birth cohort study. BMC Gastroenterology. ISSN 1471-230X. 23, p. 1–9. doi: 10.1186/s12876-023-02840-1. Full text in Research Archive
• Aasen, Eline R. Hildursdotter Vatne; Søvik, Marte Løvaas; Størdal, Ketil & Lee, Anja (2023). Are We on the Same Page? Exploring Pediatric Patients’ Involvement With Advance Care Planning. Journal of Pain and Symptom Management. ISSN 0885-3924. 66(3), p. 353–363. doi: 10.1016/j.jpainsymman.2023.04.003. Full text in Research Archive
• Closs, Emilie Raaum; Mårild, Karl Staffan; Nielsen, Rasmus Gaardskær & Størdal, Ketil (2023). Use of proton pump inhibitors in scandinavian children and adolescents: An observational study. Frontiers in pediatrics. ISSN 2296-2360. 11. doi: 10.3389/fped.2023.1052978. Full text in Research Archive
• Rossholt, Madelaine; Wendel, Kristina; Bratlie, Marianne; Aas, Marlen Fossan; Gunnarsdottir, Gunnþórunn & Fugelseth, Drude [Show all 11 contributors for this article] (2023). Vitamin A Status in Preterm Infants Is Associated with Inflammation and Dexamethasone Exposure. Nutrients. ISSN 2072-6643. 15(2). doi: 10.3390/nu15020441. Full text in Research Archive
• Rossholt, Madelaine; Bratlie, Marianne; Wendel, Kristina; Aas, Marlen Fossan; Gunnarsdottir, Gunnþórunn & Fugelseth, Drude [Show all 10 contributors for this article] (2023). A standardized feeding protocol ensured recommended nutrient intakes and prevented growth faltering in preterm infants < 29 weeks gestation. Clinical Nutrition ESPEN. ISSN 2405-4577. 53, p. 251–259. doi: 10.1016/j.clnesp.2022.12.024. Full text in Research Archive
• Dewez, Juan Emmanuel; Pembrey, Lucy; Nijman, Ruud G.; del Torso, Stefano; Grossman, Zachi & Hadjipanayis, Adamos [Show all 54 contributors for this article] (2022). Availability and use of rapid diagnostic tests for the management of acute childhood infections in Europe: A cross-sectional survey of paediatricians. PLOS ONE. ISSN 1932-6203. 17(12). doi: 10.1371/journal.pone.0275336. Full text in Research Archive
• Jankauskaite, Lina; Grechukha, Yevgenii; Kjær, Kristin Avranden; Mamenko, Marina; Nakstad, Britt & Romankevych, Ivanna [Show all 13 contributors for this article] (2022). Overuse of medical care in paediatrics: A survey from five countries in the European Academy of Pediatrics. Frontiers in pediatrics. ISSN 2296-2360. 10, p. 1–9. doi: 10.3389/fped.2022.945540. Full text in Research Archive
• Ulnes, Maria; Albrektsson, Henrik; Størdal, Ketil; Saalman, Robert; Ludvigsson, Jonas F. & Mårild, Karl Staffan (2022). Regional Swedish study found that one in seven coeliac patients experienced loss of follow up during childhood. Acta Paediatrica. ISSN 0803-5253. p. 1–12. doi: 10.1111/apa.16633. Full text in Research Archive
• Giannoni, Eric; Dimopoulou, Varvara; Klingenberg, Claus Andreas; Navér, Lars; Nordberg, Viveka & Berardi, Alberto [Show all 25 contributors for this article] (2022). Analysis of Antibiotic Exposure and Early-Onset Neonatal Sepsis in Europe, North America, and Australia. JAMA Network Open. ISSN 2574-3805. 5(11), p. 1–13. doi: 10.1001/jamanetworkopen.2022.43691. Full text in Research Archive
• Mearin, Maria Luisa; Agardh, Daniel; Antunes, Henedina; Al-Toma, Abdul; Auricchio, Renata & Castillejo, Gemma [Show all 34 contributors for this article] (2022). ESPGHAN Position Paper on Management and Follow-up of Children and Adolescents with Celiac Disease. Journal of Pediatric Gastroenterology and Nutrition - JPGN. ISSN 0277-2116. 75(3), p. 369–386. doi: 10.1097/MPG.0000000000003540.
• Arntzen, Sigurd Storehaug; Gjefsen, Hege Marie; Telle, Kjetil Elias; Magnusson, Karin; Størdal, Ketil & Håberg, Siri Eldevik [Show all 7 contributors for this article] (2022). General practitioner visits after SARS-CoV-2 omicron compared with the delta variant in children in Norway: a prospective nationwide registry study. BMJ Paediatrics Open. ISSN 2399-9772. 6(1), p. 1–6. doi: 10.1136/bmjpo-2022-001502. Full text in Research Archive
• Rantala, Aino; Tapia, German; Magnus, Maria Christine; Stene, Lars Christian Mørch; Jaakkola, Jouni J. K. & Størdal, Ketil [Show all 8 contributors for this article] (2022). Maternal antibiotic use and infections during pregnancy and offspring asthma: the Norwegian Mother, Father and Child Cohort Study and a nationwide register cohort. European Journal of Epidemiology (EJE). ISSN 0393-2990. 37, p. 983–992. doi: 10.1007/s10654-022-00897-y. Full text in Research Archive Show summary

  Maternal antibiotic use during pregnancy has been linked to asthma risk in children, but the role of underlying infections remains unclear. We investigated the association of maternal antibiotic use and infections during pregnancy with offspring risk of asthma. We used two population-based cohorts: the Norwegian Mother, Father and Child Cohort Study (MoBa) (n = 53 417) and a register-based cohort (n = 417 548). Asthma was defined based on dispensed asthma medications at 7 and 13 years from the Norwegian Prescription Database. Self-reported information on antibiotic use and infections during pregnancy was available in MoBa, while registrations of dispensed prescriptions were used to classify use of antibiotics in the register-based cohort. Maternal antibiotic use during pregnancy was associated with asthma at 7 in both cohorts (adjusted risk ratio (aRR) 1.23, 95% CI 1.11–1.37 in MoBa and 1.21, 1.16–1.25 in the register cohort) and asthma at 13 in the register cohort (1.13, 1.03–1.23) after adjusting for maternal characteristics. In MoBa, the estimate was attenuated after adjusting for infections during pregnancy. Maternal lower and upper respiratory tract infections (aRR 1.30, 95% CI 1.07–1.57 and 1.19, 1.09–1.30, respectively) and urinary tract infections (1.26, 1.11–1.42) showed associations with asthma at 7. Register cohort also showed an increased risk of asthma in relation to maternal antibiotics before and after pregnancy. Our findings suggest that both maternal antibiotics and infections during pregnancy have a role in the risk of offspring asthma. However, results from the register cohort suggest that the effect of antibiotics may reflect the shared underlying susceptibility.

• Bøås, Håkon; Bekkevold, Terese; Havdal, Lise Beier; Kran, Anne-Marte Bakken; Rojahn, Astrid & Størdal, Ketil [Show all 16 contributors for this article] (2022). The burden of hospital-attended influenza in Norwegian children. Frontiers in pediatrics. ISSN 2296-2360. 10. doi: 10.3389/fped.2022.963274. Full text in Research Archive
• Havdal, Lise Beier; Bøås, Håkon; Bekkevold, Terese; Kran, Anne-Marte Bakken; Rojahn, Astrid & Størdal, Ketil [Show all 15 contributors for this article] (2022). Risk factors associated with severe disease in respiratory syncytial virus infected children under 5 years of age. Frontiers in pediatrics. ISSN 2296-2360. 10. doi: 10.3389/fped.2022.1004739. Full text in Research Archive
• Gunnarsdottir, Sunna; Albrektsson, Henrik; Frydebo, Julia; Miron, Nicolae; Kindblom, Jenny M. & Størdal, Ketil [Show all 7 contributors for this article] (2022). Celiac disease screening at a pediatric outpatient clinic: a feasibility study. Scandinavian Journal of Gastroenterology. ISSN 0036-5521. 57(8), p. 912–920. doi: 10.1080/00365521.2022.2050292. Full text in Research Archive
• Lyamouri, Miriam; Mårild, Karl Staffan; Nielsen, Rasmus Gaardskær & Størdal, Ketil (2022). Proton pump inhibitors for infants in three Scandinavian countries increased from 2007 to 2020 despite international recommendations. Acta Paediatrica. ISSN 0803-5253. 111(11), p. 2222–2228. doi: 10.1111/apa.16491. Full text in Research Archive Show summary

  Aim There is weak evidence that proton pump inhibitors (PPIs) alleviate non-specific complaints often attributed to gastroesophageal reflux in infancy and international guidelines do not recommend their use. We studied PPIs dispensed for infants in three Nordic countries. Methods This was an observational population-based study of infants living in Norway, Sweden and Denmark in 2007–2020. We used nationwide pharmaceutical registers to study dispensed PPIs. The data provided a total of 3.3 million observed years on about 240 000 annual births. Results The overall use of PPIs in infancy showed a marked increase in all three countries from 2007 to 2020. In 2020, PPI dispensing was 46.4, 23.4 and 18.9 per 1000 per year in infants aged 0–11 months in Denmark, Norway and Sweden. These were increases of 357%, 585% and 556% respectively. Although the rate was highest in Denmark, it had decreased by 42% in the last 3 years of the study. Conclusion Despite international recommendations against routine PPI prescribing in infancy, dispensed PPIs increased more than fourfold on average in three Nordic countries from 2007 to 2020. The reason for this notable increase could not be established from the data, but the large variations over time, and between the countries, probably indicated unwarranted use.

• Heen, Espen Kolstad; Størdal, Ketil; Abdi, Abdirashid; Walmann, Frøydis & Lundeby, Karen Marie (2022). Facility-based care of small and sick newborns: experiences with establishing a neonatal special care unit in Somaliland. Journal of Global Health Reports (JoGHR). ISSN 2399-1623. 6. doi: 10.29392/001c.33619. Full text in Research Archive
• Pernica, Jeffrey M.; Arscott-Mills, Tonya; Steenhoff, Andrew P.; Mokomane, Margaret; Moorad, Banno & Bapabi, Mbabi [Show all 22 contributors for this article] (2022). Optimising the management of childhood acute diarrhoeal disease using a rapid test-and- treat strategy and/or Lactobacillus reuteri DSM 17938: A multicentre, randomised, controlled, factorial trial in Botswana. BMJ Global Health. ISSN 2059-7908. 7:e007826(4), p. 1–12. doi: 10.1136/bmjgh-2021-007826. Full text in Research Archive
• Magnusson, Karin; Skyrud, Katrine Damgaard; Suren, Pål; Greve-Isdahl, Margrethe; Størdal, Ketil & Kristoffersen, Doris Tove [Show all 7 contributors for this article] (2022). Healthcare use in 700 000 children and adolescents for six months after covid-19: before and after register based cohort study. The BMJ. ISSN 1756-1833. 376. doi: 10.1136/bmj-2021-066809. Full text in Research Archive
• Størdal, Ketil; Lopez-Doriga Ruiz, Paz; Greve-Isdahl, Margrethe; Suren, Pål; Knudsen, Per Kristian & Gulseth, Hanne Løvdal [Show all 7 contributors for this article] (2022). Risk factors for SARS-CoV-2 infection and hospitalisation in children and adolescents in Norway: a nationwide population-based study. BMJ Open. ISSN 2044-6055. 12. doi: 10.1136/bmjopen-2021-056549. Full text in Research Archive
• Methi, Fredrik; Størdal, Ketil; Telle, Kjetil Elias; Larsen, Vilde Bergstad & Magnusson, Karin (2022). Hospital admissions for respiratory tract infections in children aged 0–5 years for 2017/2023. Frontiers in pediatrics. ISSN 2296-2360. 9. doi: 10.3389/fped.2021.822985. Full text in Research Archive
• Havdal, Lise Beier; Bøås, Håkon; Bekkevold, Terese; Kran, Anne-Marte Bakken; Rojahn, Astrid & Størdal, Ketil [Show all 15 contributors for this article] (2021). The burden of respiratory syncytial virus in children under 5 years of age in Norway. Journal of Infection. ISSN 0163-4453. 84(2), p. 205–215. doi: 10.1016/j.jinf.2021.12.008. Full text in Research Archive Show summary

  Objectives To estimate age-specific incidence of medically attended respiratory syncytial virus (RSV) infections in hospitalised Norwegian children and describe disease epidemiology. Methods Active prospective hospital surveillance for RSV in children <59 months of age was conducted during 2015-2018. All febrile children 12-59 months of age were enrolled, whereas children <12 months were enrolled based on respiratory symptoms regardless of fever. Surveillance data were linked to national registry data to estimate the clinical burden of RSV. Results Of the children enrolled, 1096 (40%) were infected with RSV. The highest incidence rates were found in children 1 month of age, with a peak incidence of 43 per 1000 during the 2016-2017 season. In comparison, children 24-59 months of age had an infection rate of 1.4 per 1000 during the same winter season. The peak season was during the 2016-2017 winter, with an incidence rate of 6.0 per 1000 children 0-59 months of age. In the study population a total of 168 (15%) of the infected children had pre-existing medical conditions predisposing for more severe disease. High infection rates were found in this population. Conclusions Children with comorbidities showed high hospital contact rates, but the majority of children in need of medical attention associated with RSV infection were previously healthy.

• Mundal, Håkon S.; Rønnestad, Arild Erland; Klingenberg, Claus Andreas; Stensvold, Hans Jørgen & Størdal, Ketil (2021). Antibiotic Use in Term and Near-Term Newborns . Pediatrics. ISSN 0031-4005. 148(6). doi: 10.1542/peds.2021-051339. Full text in Research Archive
• Gibory, Moustafa; Bruun, Tone; Flem, Elmira; Dembinski, Jennifer Lynn; Haltbakk, Ildri & Størdal, Ketil [Show all 11 contributors for this article] (2021). Genetic diversity of rotavirus strains circulating in Norway before and after the introduction of rotavirus vaccination in children. Journal of Medical Virology. ISSN 0146-6615. 00, p. 1–8. doi: 10.1002/jmv.27484. Full text in Research Archive
• Tapia, German; Suvitaival, Tommi; Ahonen, Linda; Lund-Blix, Nicolai Andre; Njølstad, Pål Rasmus & Joner, Geir [Show all 10 contributors for this article] (2021). Prediction of type 1 diabetes at birth: Cord blood metabolites vs genetic risk score in the Norwegian mother, father, and child cohort. Journal of Clinical Endocrinology and Metabolism (JCEM). ISSN 0021-972X. 106(10), p. E4062–E4071. doi: 10.1210/clinem/dgab400. Full text in Research Archive
• Holte, Kari; Ersdal, Hege Langli; Klingenberg, Claus; Eilevstjønn, Joar; Stigum, Hein & Jatosh, Samwel [Show all 8 contributors for this article] (2021). Expired carbon dioxide during newborn resuscitation as predictor of outcome. Resuscitation. ISSN 0300-9572. 166, p. 121–128. doi: 10.1016/j.resuscitation.2021.05.018. Full text in Research Archive
• Mikalsen, Ingvild Bruun; Halvorsen, Thomas; Juliusson, Pétur Benedikt; Magnus, Maria Christine; Nystad, Wenche & Stensrud, Trine [Show all 9 contributors for this article] (2021). Early life growth and associations with lung function and bronchial hyperresponsiveness at 11-years of age. Respiratory Medicine. ISSN 0954-6111. 177, p. 1–8. doi: 10.1016/j.rmed.2021.106305. Full text in Research Archive
• Bruun, Tone; Valcarcel Salamanca, Beatriz; Bekkevold, Terese; Døllner, Henrik; Gibory, Moustafa & Gilje, Ann Marit [Show all 14 contributors for this article] (2021). Impact of the Rotavirus Vaccination Program in Norway after Four Years with High Coverage. The Pediatric Infectious Disease Journal. ISSN 0891-3668. p. 368–374. doi: 10.1097/INF.0000000000003020. Full text in Research Archive
• Mårild, Karl Staffan; Ohlsson, Claes; Bygdell, Maria; Martikainen, Jari; Sävendahl, Lars & Størdal, Ketil [Show all 7 contributors for this article] (2020). Growth and Pubertal Timing in Boys With Adult-diagnosed Celiac Disease: A Population-based Longitudinal Cohort Study. Journal of Pediatric Gastroenterology and Nutrition - JPGN. ISSN 0277-2116. 70(6), p. 853–857. doi: 10.1097/MPG.0000000000002682.
• Størdal, Ketil; Bakken, Inger Johanne Landsjøåsen; Greve-Isdahl, Margrethe; Klingenberg, Claus; Helland, Eyvind & Nystad, Wenche [Show all 8 contributors for this article] (2020). Sars-CoV-2 hos barn og ungdom i Norge: Påvist smitte, sykehusinnleggelser og underliggende tilstander. Tidsskrift for Den norske legeforening. ISSN 0029-2001. 140(11), p. 1–9. doi: 10.4045/tidsskr.20.0457. Full text in Research Archive
• Stahl, Marisa G.; Dong, Fran; Lamb, Molly M.; Waugh, Kathleen C.; Taki, Iman & Størdal, Ketil [Show all 11 contributors for this article] (2020). Childhood growth prior to screen-detected celiac disease: prospective follow-up of an at-risk birth cohort. Scandinavian Journal of Gastroenterology. ISSN 0036-5521. 55(11), p. 1284–1290. doi: 10.1080/00365521.2020.1821087. Full text in Research Archive
• Størdal, Ketil; Kahrs, Christian Riddervold; Tapia, German; Agardh, Daniel; Kurppa, Kalle & Stene, Lars Christian Mørch (2020). Review article: exposure to microbes and risk of coeliac disease. Alimentary Pharmacology and Therapeutics. ISSN 0269-2813. 53(1), p. 43–62. doi: 10.1111/apt.16161. Full text in Research Archive
• Tapia, German; Chudá, Kateřina; Kahrs, Christian Riddervold; Stene, Lars Christian Mørch; Kramna, Lenka & Mårild, Karl [Show all 10 contributors for this article] (2020). Parechovirus Infection in Early Childhood and Association With Subsequent Celiac Disease. American Journal of Gastroenterology. ISSN 0002-9270. 116(4), p. 788–795. doi: 10.14309/ajg.0000000000001003. Full text in Research Archive
• Holte, Kari; Ersdal, Hege Langli; Eilevstjønn, Joar; Gomo, Øystein; Klingenberg, Claus & Thallinger, Monica [Show all 11 contributors for this article] (2020). Positive end-expiratory pressure in newborn resuscitation around term: A randomized controlled trial. Pediatrics. ISSN 0031-4005. 146(4), p. 1–12. doi: 10.1542/peds.2020-0494.
• Lund-Blix, Nicolai Andre; Tapia, German; Mårild, Karl Staffan; Brantsæter, Anne Lise; Eggesbø, Merete Åse & Mandal, Siddhartha [Show all 8 contributors for this article] (2020). Maternal fibre and gluten intake during pregnancy and risk of childhood celiac disease: the MoBa study. Scientific Reports. ISSN 2045-2322. 10, p. 1–9. doi: 10.1038/s41598-020-73244-4. Full text in Research Archive
• Størdal, Ketil; Eilevstjønn, Joar; Mduma, Estomih; Holte, Kari; Thallinger, Monica & Linde, Jørgen Erland [Show all 9 contributors for this article] (2020). Increased perinatal survival and improved ventilation skills over a five-year period: An observational study. PLOS ONE. ISSN 1932-6203. 15(10), p. 1–14. doi: 10.1371/journal.pone.0240520. Full text in Research Archive
• Lundeby, Karen Marie; Heen, Espen Kolstad; Mosa, Mohammed; Abdi, Abdirashid & Størdal, Ketil (2020). Neonatal morbidity and mortality in Hargeisa, Somaliland: An observational, hospital based study. Pan African Medical Journal. ISSN 1937-8688. 37(3). doi: 10.11604/pamj.2020.37.3.24741. Full text in Research Archive
• Tapia, German; Mortimer, Georgina; Ye, Jody; Mårild, Karl Staffan; Chipper-Keating, Saranna & Gillard, Benjamin Thomas [Show all 11 contributors for this article] (2020). Maternal microchimerism in cord blood and risk of celiac disease in childhood. Journal of Pediatric Gastroenterology and Nutrition - JPGN. ISSN 0277-2116. 71(3), p. 321–327. doi: 10.1097/MPG.0000000000002811. Full text in Research Archive
• Lund-Blix, Nicolai Andre; Tapia, German; Mårild, Karl Staffan; Brantsæter, Anne Lise; Njølstad, Pål Rasmus & Joner, Geir [Show all 9 contributors for this article] (2020). Maternal and child gluten intake and association with type 1 diabetes: The Norwegian Mother and Child Cohort Study. PLoS Medicine. ISSN 1549-1277. 17(3), p. 1–15. doi: 10.1371/journal.pmed.1003032. Full text in Research Archive
• Dretvik, Thomas Bruvoll; Solevåg, Anne Lee; Finvåg, Andreas; Størdal, Eline Hasselgård; Størdal, Ketil & Klingenberg, Claus (2020). Active antibiotic discontinuation in suspected but not confirmed early‐onset neonatal sepsis—A quality improvement initiative. Acta Paediatrica. ISSN 0803-5253. 109(6), p. 1125–1130. doi: 10.1111/apa.15202. Full text in Research Archive
• Husby, Steffen; Koletzko, Sibylle; Korponay-Szabó, Ilma R.; Kurppa, Kalle; Mearin, M. Luisa & Ribes-Koninckx, Carmen [Show all 21 contributors for this article] (2019). European Society Paediatric Gastroenterology, Hepatology and Nutrition guidelines for diagnosing coeliac disease 2020. Journal of Pediatric Gastroenterology and Nutrition - JPGN. ISSN 0277-2116. 70(1), p. 141–156. doi: 10.1097/MPG.0000000000002497. Full text in Research Archive
• Størdal, Ketil; Wyder, Corinne; Trobisch, Andreas; Grossman, Zachi & Hadjipanayis, Adamos (2019). Overtesting and overtreatment-statement from the European Academy of Paediatrics (EAP). European Journal of Pediatrics. ISSN 0340-6199. 178(12), p. 1923–1927 . doi: 10.1007/s00431-019-03461-1.
• Olsen, Annette; Iversen, Cathrine & Størdal, Ketil (2019). Bruk av lystgass hos barn. Tidsskrift for Den norske legeforening. ISSN 0029-2001. 139(12). doi: 10.4045/tidsskr.18.0338.
• Holte, Kari; Ersdal, Hege Langli; Eilevstjønn, Joar; Thallinger, Monica; Linde, Jørgen Erland & Klingenberg, Claus [Show all 10 contributors for this article] (2019). Predictors for expired CO2 in neonatal bag-mask ventilation at birth: observational study. BMJ Paediatrics Open. ISSN 2399-9772. 3(1). doi: 10.1136/bmjpo-2019-000544. Full text in Research Archive
• Elverud, Ingvild Skålnes; Størdal, Ketil; Chiduo, Mercy Grace & Klingenberg, Claus (2019). Factors influencing growth of children aged 12-24 months in the Tanga Region, Tanzania. Journal of Tropical Pediatrics. ISSN 0142-6338. 66(2), p. 210–217. doi: 10.1093/tropej/fmz056. Full text in Research Archive
• Lund-Blix, Nicolai Andre; Mårild, Karl Staffan; Tapia, German; Norris, Jill M.; Stene, Lars Christian Mørch & Størdal, Ketil (2019). Gluten Intake in Early Childhood and Risk of Celiac Disease in Childhood: A Nationwide Cohort Study. American Journal of Gastroenterology. ISSN 0002-9270. 114(8), p. 1299–1306. doi: 10.14309/ajg.0000000000000331.
• Tapia, German; Mortimer, Georgina; Ye, Jody; Gillard, Benjamin Thomas; Chipper-Keating, Saranna & Mårild, Karl Staffan [Show all 14 contributors for this article] (2019). Maternal microchimerism in cord blood and risk of childhood-onset type 1 diabetes. Pediatric Diabetes. ISSN 1399-543X. 20(6), p. 728–735. doi: 10.1111/pedi.12875. Full text in Research Archive
• Mårild, Karl Staffan; Dong, Fran; Lund-Blix, Nicolai Andre; Seifert, Jennifer; Barón, Anna E. & Waugh, Kathleen C. [Show all 14 contributors for this article] (2019). Gluten Intake and Risk of Celiac Disease: Long-Term Follow-up of an At-Risk Birth Cohort. American Journal of Gastroenterology. ISSN 0002-9270. 114(9), p. 1307–1314. doi: 10.14309/ajg.0000000000000255.
• Lund-Blix, Nicolai Andre; Dong, Fran; Mårild, Karl Staffan; Seifert, Jennifer; Barón, Anna E. & Waugh, Kathleen C. [Show all 13 contributors for this article] (2019). Gluten Intake and Risk of Islet Autoimmunity and Progression to Type 1 Diabetes in Children at Increased Risk of the Disease: The Diabetes Autoimmunity Study in the Young (DAISY). Diabetes Care. ISSN 0149-5992. 42(5), p. 789–796. doi: 10.2337/dc18-2315.
• Mårild, Karl Staffan; Tapia, German; Midttun, Øivind; Ueland, Per Magne; Magnus, Maria Christine & Rewers, Marian [Show all 8 contributors for this article] (2019). Smoking in pregnancy, cord blood cotinine and risk of celiac disease diagnosis in offspring. European Journal of Epidemiology (EJE). ISSN 0393-2990. 34(7). doi: 10.1007/s10654-019-00522-5.
• Sander, Stine Dydensborg; Andersen, Anne-Marie Nybø; Murray, Joseph A.; Karlstad, Øystein; Husby, Steffen & Størdal, Ketil (2019). Association Between Antibiotics in the First Year of Life and Celiac Disease. Gastroenterology. ISSN 0016-5085. 156(8), p. 2217–2229. doi: 10.1053/j.gastro.2019.02.039.
• Kahrs, Christian Riddervold; Chuda, Katerina; Tapia, German; Stene, Lars Christian Mørch; Mårild, Karl Staffan & Rasmussen, Trond [Show all 11 contributors for this article] (2019). Enterovirus as trigger of coeliac disease: nested case-control study within prospective birth cohort. BMJ (Clinical Research Edition). ISSN 0959-8138. 364. doi: 10.1136/bmj.l231. Full text in Research Archive

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• Størdal, Ketil & Hjørleifsson, Stefan (2023). Fem år med Gjør kloke valg – hjelper det? Tidsskrift for Den norske legeforening. ISSN 0029-2001. 143(17). doi: 10.4045/tidsskr.23.0627.
• Kvammen, Janne Anita; Brattlie, Marianne; Thomassen, Rut Anne; Størdal, Ketil; Midtsund, Astrid Durdei & Brun, Anne Charlotte [Show all 7 contributors for this article] (2023). Ubegrunnet usikkerhet om spedbarnsmat. nrk.no/ytring.
• Midtsund, Astrid Durdei; Brun, Anne Charlotte; Størdal, Ketil; Kvammen, Janne Anita; Thomassen, Rut Anne & Brattlie, Marianne [Show all 7 contributors for this article] (2023). Ikke bare barnemat. NRK Ytring.
• Størdal, Ketil; Henjum, Sigrun; Brun, Anne Charlotte; Kvammen, Janne Anita; Thomassen, Rut Anne & Midtsund, Astrid [Show all 7 contributors for this article] (2023). Ikke bare barnemat. nrk.no/ytring.
• Brun, Anne Charlotte; Størdal, Ketil; Kvammen, Janne Anita; Thomassen, Rut Anne & Henjum, Sigrun (2023). Ikke bare barnemat. nrk.no/ytring.
• Stocker, Martin; Klingenberg, Claus Andreas; Navér, Lars; Nordberg, Viveka; Berardi, Alberto & el Helou, Salhab [Show all 25 contributors for this article] (2023). Less is more: Antibiotics at the beginning of life. Nature Communications. ISSN 2041-1723. 14(1). doi: 10.1038/s41467-023-38156-7. Full text in Research Archive
• Heen, Espen Kolstad; Størdal, Ketil; Wachira, John; Heen, Ingjerd & Lundeby, Karen Marie (2023). Do we need a new global policy for ending preventable perinatal deaths in fragile low-income countries? Journal of Global Health. ISSN 2047-2978. 13. doi: 10.7189/jogh.13.03008.
• Havdal, Lise Beier; Bøås, Håkon; Bekkevold, Terese; Kran, Anne-Marte Bakken; Rojahn, Astrid & Størdal, Ketil [Show all 15 contributors for this article] (2022). Corrigendum to ‘The burden of respiratory syncytial virus in children under 5 years of age in Norway’ [Journal of Infection Volume 84, Issue 2 (2022) Pages 205-215, (S0163445321005995), (10.1016/j.jinf.2021.12.008)]. Journal of Infection. ISSN 0163-4453. doi: 10.1016/j.jinf.2022.12.018.
• Henriksen, Christine; Thomassen, Rut Anne; Kvammen, Janne Anita & Størdal, Ketil (2022). Fullamming til 6 måneder er ikke det beste for barnet. Norsk tidsskrift for ernæring (NTFE). ISSN 1503-5034.
• Størdal, Ketil; Henriksen, Christine; Kvammen, Janne Anita & Thomassen, Rut Anne (2022). Gi babyer fast føde. nrk.no/ytring.
• Rettedal, Siren; Kibsgaard-Petersen, Amalie; Eilevstjønn, Joar; Kvaløy, Jan Terje; Bjorland, Peder Aleksander & Lillevik, Hanne Markhus [Show all 12 contributors for this article] (2022). Impact of immediate and continuous heart rate feedback by dry electrode ECG on time to initiation of ventilation after birth: protocol for a randomised controlled trial. BMJ Open. ISSN 2044-6055. 12(9), p. 1–6. doi: 10.1136/bmjopen-2022-061839. Full text in Research Archive
• Heen, Espen Kolstad; Størdal, Ketil; Wachira, John; Heen, Ingjerd & Lundeby, Karen Marie (2022). Do we need a new global policy for ending preventable perinatal deaths in fragile low-income countries? Journal of Global Health. ISSN 2047-2978. 12. doi: 10.7189/jogh.12.03020. Full text in Research Archive
• Andersen, Svend; Bernklev, Tomm; Størdal, Ketil; Perminow, Gøri & Høivik, Marte Lie (2022). Paediatric IBD incidence increases in South-East Norway.
• Størdal, Ketil; Kahrs, Christian Riddervold; Tapia, German; Agardh, Daniel; Kurppa, Kalle & Stene, Lars Christian Mørch (2021). Letter: risk of coeliac disease—do microbial derived factors promote and protect? Authors' reply. Alimentary Pharmacology and Therapeutics. ISSN 0269-2813. 53(12). doi: 10.1111/apt.16389.
• Vogt, Henrik; Størdal, Ketil & Suren, Pål (2021). Hvor redde skal foreldre være for «long covid»? Aftenposten (morgenutg. : trykt utg.). ISSN 0804-3116.
• Grødeland, Gunnveig; Fossum, Even & Størdal, Ketil (2021). Vaksinepodden: Barn, Covid og vaksiner.
• Størdal, Ketil (2021). COVID-19: children are not just small adults. Tidsskrift for Den norske legeforening. ISSN 0029-2001. 141(14). doi: 10.4045/tidsskr.21.0656.
• Størdal, Ketil; Greve-Isdahl, Margrethe & Suren, Pål (2021). Når tiltaket er verre enn pandemien. Tidsskrift for Den norske legeforening. ISSN 0029-2001. 141(3). doi: 10.4045/tidsskr.21.0055.
• Størdal, Ketil (2021). Growth and the changing faces of coeliac disease. Acta Paediatrica. ISSN 0803-5253. 110(7), p. 1987–1988. doi: 10.1111/apa.15855.
• Øymar, Knut Asbjørn Alexander; Karlstad, Øystein & Størdal, Ketil (2021). Har anbefalinger om endring av behandling effekt? Tidsskrift for Den norske legeforening. ISSN 0029-2001. 141(12), p. 1–3. doi: 10.4045/tidsskr.21.0437.
• Brodwall, Kristoffer & Størdal, Ketil (2020). Verdens barn er sarbare for ringvirkninger av pandemien. Tidsskrift for Den norske legeforening. ISSN 0029-2001. 140(9), p. 1–3. doi: 10.4045/tidsskr.20.0433.
• Størdal, Ketil & Hjørleifsson, Stefan (2020). Kan vi gjøre klokere valg? Tidsskrift for Den norske legeforening. ISSN 0029-2001. 140(2). doi: 10.4045/tidsskr.19.0759.
• Kristensen, Vendel Ailin; Lund, Charlotte; Opheim, Randi; Ricanek, Petr; Huppertz-Hauss, Gert & Perminow, Gøri Margrete [Show all 37 contributors for this article] (2020). Inflammatory Bowel Disease in South-Eastern Norway III – IBSEN III.
• Størdal, Ketil (2019). Svar til Wester fra Norsk barnelegeforening. Tidsskrift for Den norske legeforening. ISSN 0029-2001. 139(8). doi: 10.4045/tidsskr.19.0295.
• Lee, Anja; Størdal, Ketil; Haugstad, Kirsti Egge; Ziener, Vigdis Margrethe & Winger, Anette (2019). Palliasjon må samles gjennom gode grunnleggende tjenester. Dagens medisin. ISSN 1501-4290.
• Lee, Anja; Størdal, Ketil; Haugstad, Kirsti Egge; Ziener, Vigdis Margrethe & Winger, Anette (2019). Hvordan skal barn best få leve? Dagens medisin. ISSN 1501-4290.
• Størdal, Ketil; Lee, Anja; Grøgaard, Jens; Haugstad, Kirsti Egge & Winger, Anette (2019). Når et barn skal dø. Dagsavisen. ISSN 1503-2892.

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