Elisabeth Toverud Landaas

• Kildal, Anders Benjamin; Ueland, Thor; Mirlashari, Mohammad Reza; Nissen-Meyer, Lise Sofie; Granerud, Beathe Kiland & Riise, Anne Margarita Dyrhol [Show all 44 contributors for this article] (2026). Serial blood serum measurements of calprotectin and deoxyribonuclease in COVID-19 patients during hospitalization and recovery until one year: a prospective, multicenter, observational study. BMC Infectious Diseases. 26. doi: 10.1186/s12879-026-12939-x. Full text in Research Archive Show summary

  Objectives: To examine circulating calprotectin and deoxyribonuclease (DNase) serum levels during hospitalization in COVID-19 patients, their continuity post-discharge and dynamics in relation to disease severity. Methods: Serum levels were measured in samples collected from 252 COVID-19 patients during hospitalization (admission, days 3–5 and 7–10), at 3 months and after 1 year, and related to admission to intensive care unit (ICU) or high dependency unit (HDU), and 60-day total mortality. Results: During hospitalization, calprotectin and DNase levels were significantly elevated compared to healthy controls (HC). Calprotectin was increased in ICU/HDU patients compared to those at wards during hospitalization and in non-survivors compared to survivors during prolonged hospitalization. High calprotectin levels at admission were associated with male sex, PaO2/FiO2 ratio and national COVID-19 wave 2 and 3 compared to wave 1. High admission levels of both calprotectin and ferritin were associated with an approximately twofold higher odds ratio for ICU/HDU admission than either marker alone. DNase was lower at admission in non-survivors compared to survivors. Post-discharge, DNase but not calprotectin levels remained elevated extending to 1-year follow-up compared to HC. Conclusions: COVID‑19 non‑survivors showed persistently higher calprotectin levels during prolonged hospitalization, and elevated admission calprotectin was associated with later pandemic waves and poorer oxygenation. Incorporating calprotectin with ferritin improved prediction of ICU/HDU admission. DNase levels were lower at admission in non‑survivors, while overall DNase remained elevated from hospitalization through 1‑year follow‑up compared with HC, suggesting a possible role in long‑term COVID‑19–related immune alterations.

• Benschop, Kimberley S.M.; Zwagemaker, Florian; Andersson-Li, Lili; Andrés, Cristina; Antón, Andrés & Berengua, Carla [Show all 77 contributors for this article] (2026). Next generation sequencing approaches for the detection and characterization of enteroviruses in clinical, public health, and research settings: Expert view of the European non-polio enterovirus network (ENPEN). Journal of Clinical Virology. ISSN 1386-6532. 184. doi: 10.1016/j.jcv.2026.105940. Full text in Research Archive
• Hirvonen, Aurora; Johannesen, Caroline Klint; Simmonds, Peter; Fischer, Thea K.; Harvala, Heli & Benschop, Kimberley S.M. [Show all 50 contributors for this article] (2025). Sustained circulation of enterovirus D68 in Europe in 2023 and the continued evolution of enterovirus D68 B3-lineages associated with distinct amino acid substitutions in VP1 protein. Journal of Clinical Virology. ISSN 1386-6532. 178. doi: 10.1016/j.jcv.2025.105785. Full text in Research Archive Show summary

  Background Enterovirus D68 (EV-D68) causes respiratory disease ranging from mild to severe and in rare cases a paralytic syndrome, called acute flaccid myelitis (AFM). Since the global EV-D68 outbreak in 2014, the virus has mainly circulated in biennial epidemic cycles with peaks detected during even years. However, following the COVID-19 pandemic, the seasonal pattern of EV-D68 has been characterized by large yearly upsurges. Here, we describe the circulation of EV-D68 in Europe in 2023 and track its genetic evolution. Study design Data was compiled from members of the European Non-Polio Network (ENPEN). This included monthly data on the total number of EV samples tested, EV positive samples, EV-D68 positive samples and cases, and other EV positive samples detected in 2023. Information on sample types and surveillance system was recorded. Sequence data from the VP1 gene was used for phylogenetic and amino acid sequence analysis. Results EV was detected in 13,585 out of 203,622 diagnostic samples tested (6.7 %), of which 402 (3.0 %) were determined as EV-D68, representing 386 cases. EV-D68 infections peaked in October 2023 (136/386; 35.2 %). 267/386 (69.2 %) of EV-D68 cases were captured through clinical EV surveillance, almost all of which (202/204 of positive samples with sample type information) were detected in respiratory specimens. Phylogenetic analysis performed on 99 VP1 sequences revealed a distinct B3-derived lineage with a previously undescribed residue change, D554E, in Europe. Conclusions The study documents sustained circulation of EV-D68 in Europe in 2023, the evolution of B3-derived lineages, and appearance of previously undescribed amino acid substitutions in Europe. This stresses the need for continuous EV-D68 surveillance and harmonization of EV-D68 detection practices towards better data comparability across countries.

• Schrijver, Sten de; Vanhulle, Emiel; Ingenbleek, Anne; Alexakis, Leonidas; Johannesen, Caroline Klint & Broberg, Eeva K [Show all 50 contributors for this article] (2025). Epidemiological and Clinical Insights into Enterovirus Circulation in Europe, 2018–2023: A Multicenter Retrospective Surveillance Study. Journal of Infectious Diseases. ISSN 0022-1899. 232(1), p. e104–e115. doi: 10.1093/infdis/jiaf179. Full text in Research Archive Show summary

  Background Enteroviruses (EV) cause yearly outbreaks with severe infections, particularly in young children. This study investigates EV circulation, age, and clinical presentations in Europe from 2018 to 2023. Methods Aggregated data were requested from the European Centre for Disease Prevention and Control National Focal Points for Surveillance and European Non-Polio Enterovirus Network. Data included detection month, specimen type, age group, and clinical presentation for the 10 most commonly reported EV types per year. Results Twenty-eight institutions (16 countries) reported 563 654 EV tests during the study period with 33 265 (5.9%) EV positive. Forty-two types were identified (n = 11 605 cases) with echovirus 30 (E30), coxsackievirus A6 (CVA6), EV-D68, E9, E11, CVB5, E18, CVB4, EV-A71, and E6 most frequently reported. E30 declined after 2018/2019, while CVA6, CVB5, E9, E11, and EV-D68 were prevalent both before and after the coronavirus disease 2019 (COVID-19) pandemic, and CVB4 and E18 were prevalent after the pandemic. A shift in seasons (summer to fall) and specimen positivity (feces to respiratory) was observed. Neurological signs predominated among EV-A71, CVB4, CVB5, E6, E9, E11, E18, and E30 (30%–72%). CVB4, CVB5, E9, E11, and E18 were frequently reported among neonates (18%–32%). CVA6 was frequently associated with hand, foot and mouth disease, and EV-D68 with respiratory infections. Paralysis was reported among 22 infections, associated with 10 nonpolio types. Conclusions This study emphasizes the widespread circulation and severity of EV infections in Europe, as well as the (re)emergence of specific types postpandemic. Our findings highlight the need for continuous EV surveillance to monitor variation in circulation, age, and clinical presentations, including paralysis among nonpolio EV infections.

• Granerud, Beathe Kiland; Kaarbø, Mari; Al-Baldawi, Huda; Heggelund, Lars; Tveita, Anders & Müller, Karl Erik [Show all 42 contributors for this article] (2025). Droplet Digital PCR or Real-Time PCR as a Method for Quantifying SARS-CoV-2 RNA in Plasma-Is There a Difference? Viruses. 17(6). doi: 10.3390/v17060772. Full text in Research Archive Show summary

  The aim of this study is to ascertain whether qRT-PCR (reverse transcriptase real-time PCR) or RT-ddPCR (reverse transcriptase digital droplet PCR) is more effective for detecting SARS-CoV-2 RNA (severe acute respiratory syndrome coronavirus 2 RNA) in blood plasma from COVID-19 (coronavirus infectious disease-19) patients. The E-gene of SARS-CoV-2 RNA was quantified using both methods in 128 plasma samples from 70 hospitalized patients, followed by a statistical analysis to compare the sensitivity and concordance between the methods. Out of the 128 samples, 89 yielded consistent results irrespective of the method used, whereas 39 samples showed discrepancies between the two different methods. RT-ddPCR frequently registered higher viral quantities compared to qRT-PCR; however, the results did not demonstrate a clear superiority in sensitivity for RT-ddPCR. Although RT-ddPCR registered higher viral quantities, this study concludes that both methods provide comparable results for detecting SARS-CoV-2 E-gene RNA in plasma.

• Landaas, Elisabeth Toverud; Klundby, Ingvild; Knudsen, Per Kristian; Kran, Anne-Marte Bakken; Dudman, Susanne Gjeruldsen & Lind, Andreas [Show all 7 contributors for this article] (2024). Emergence of enterovirus D68 in a Norwegian paediatric population 2012-2022. Frontiers in Virology. 4, p. 1–7. doi: 10.3389/fviro.2024.1358963. Full text in Research Archive Show summary

  Background: Enterovirus D68 (EV-D68) primarily causes respiratory infection, occasionally manifesting with neurological symptoms. Outbreak reports have been published from various countries including Norway, but a longitudinal study on EV-D68 prevalence in Northern Europe is lacking. Methods: Respiratory samples from children ≤14 years received at Oslo University Hospital in the years 2012-2022 were examined for EV-D68. Samples from 2012-2015 were retrospectively screened using a semi-specific RT-PCR, with positive samples confirmed by an EV-D68 specific RT-PCR. Samples from 2016-2022 underwent routine diagnostics with the EV-D68 specific RT-PCR. Results: Among the 22,911 samples tested, EV-D68 was detected in 338 samples (324 patients). Most EV-D68 cases occurred in August to December. The highest detection rate was recorded in 2014, 2016 and 2022 (6.0%, 7.8% and 6.6% of samples from August-December). Lower frequencies were observed in 2018 and 2019 (1.0% and 2.4%), and in the years before the 2014 outbreak (2012: 1.3%, 2013: 0.8%). Few cases were identified in 2020-2021. Children aged 0-1 years accounted for 40%, and 0-4 years for 78%, of the EV-D68 positive patients. Most of the patients with EV-D68 (83%) were hospitalised. Discussion: Also in Norway, EV-D68 has caused outbreaks with significant disease burden, especially among the youngest children. The detection rate varies, with a trend towards biennial outbreaks, except for low numbers in 2018 and during the COVID-19 restrictions (2020-2021). Due to its potential for severe respiratory illness and significant neurological complications, conducting EV-D68 testing is essential both for diagnosing clinically suspected cases, and for monitoring the disease burden.

• Dudman, Susanne; Klundby, Ingvild; Øverbø, Joakim; Numanovic, Sanela; Nilsen, Mariann & Lind, Andreas [Show all 8 contributors for this article] (2024). Trends in the enterovirus surveillance in Oslo, Norway before and during the COVID-19 pandemic. Frontiers in Virology. 3. doi: 10.3389/fviro.2023.1343781. Full text in Research Archive Show summary

  Background: Enteroviruses have the potential to cause both high morbidity and mortality especially in children. High season in Norway is between August and November, but this seasonality was interrupted by the COVID-19 pandemic. Methods: In this study, we describe the enterovirus surveillance in Norway before and during the COVID-19 pandemic including the years from the start of 2016 until the end of 2022. Screening of enterovirus was performed by both laboratory developed methods and FilmArray® ME Panel. Relevant samples were typed, mostly by VP1 sequencing. Results: Seventy-four percent of all cases occurred in infants under five years of age. A significant reduction in positive cases was observed during the peak years of the COVID-19 pandemic compared to the years before. Pre-pandemic, a wide range of types from all four enterovirus species were detected. During the years with COVID-19 infection control measures, significantly fewer enterovirus types were found along with a substantial reduction in the detection rate. Conclusion: Enterovirus surveillance discovered a large amount of different types mainly affecting infants. The positivity rate was markedly reduced during the pandemic in 2020-2022 and fewer types occurred.

• Skjælaaen, Katarina; Nesvold, Helle; Brekke, Mette; Sare, Miriam; Landaas, Elisabeth Toverud & Mdala, Ibrahimu [Show all 8 contributors for this article] (2022). Sexually transmitted infections among patients attending a sexual assault centre: a cohort study from Oslo, Norway. BMJ Open. 12:e064934(12), p. 1–9. doi: 10.1136/bmjopen-2022-064934. Full text in Research Archive Show summary

  Objectives We estimate the prevalence of sexually transmitted infection (STI) among patients after sexual assault, assess the possible value of azithromycin prophylaxis, and identify risk factors for assault-related STI and for not presenting at follow-up. Design Prospective observational cohort study. Setting Sexual assault centre in Oslo, Norway. Participants 645 patients, 602 (93.3%) women and 43 (6.7%) men, attending the centre from May 2017 to July 2019. Outcome measures Microbiological testing at the primary examination and at follow-up consultations after 2, 5 and 12 weeks. Estimated relative risk for assault-related STI and for not presenting at follow-up. Results At primary examination, the prevalence of genital chlamydia was 8.4%, Mycoplasma genitalium 6.4% and gonorrhoea 0.6%. In addition, the prevalence of bacterial STI diagnosed at follow-up and possibly from the assault was 3.0% in total: 2.5% for M. genitalium, 1.4% for genital chlamydia and 0.2% for gonorrhoea. This prevalence did not change when azithromycin was no longer recommended from January 2018. There were no new cases of hepatitis B, hepatitis C, HIV or syphilis. We found no specific risk factors for assault-related STI. Patients with previous contact with child welfare service less often presented to follow-up (relative risk (RR) 2.0 (95% CI 1.1 to 3.5)), as did patients with a history of sex work (RR 3.6 (1.2 to 11.0)) or substance abuse (RR 1.7 (1.1 to 2.7)). Conclusions Most bacterial STIs were diagnosed at the primary examination, hence not influenced by prophylaxis. There was no increase in bacterial STI diagnosed at follow-up when azithromycin prophylaxis was not routinely recommended, supporting a strategy of starting treatment only when infection is diagnosed or when the patient is considered at high risk. Sex work, substance abuse and previous contact with child welfare services were associated with not presenting to follow-up.

• Lind, Andreas; Barlinn, Regine; Landaas, Elisabeth Toverud; Andresen, Lise Lima; Jakobsen, Kirsti & Fladeby, Cathrine [Show all 13 contributors for this article] (2021). Rapid SARS-CoV-2 variant monitoring using PCR confirmed by whole genome sequencing in a high-volume diagnostic laboratory. Journal of Clinical Virology. ISSN 1386-6532. 141. doi: 10.1016/j.jcv.2021.104906. Full text in Research Archive Show summary

  Objectives The emerging SARS-CoV-2 variants of concern (VoC), B.1.1.7, B.1.351 and P.1, with increased transmission and/or immune evasion, emphasise the need for broad and rapid variant monitoring. Our high-volume laboratory introduced a PCR variant assay (Variant PCR) in January 2021 based on the protocol by Vogels et al. Study design To assess whether Variant PCR could be used for rapid B.1.1.7, B.1.351 and P.1 screening, all positive SARS-CoV-2 airway samples were prospectively tested in parallel using both the Variant PCR and whole genome sequencing (WGS). Results In total 1,642 SARS-CoV-2 positive samples from individual patients were tested within a time span of 4 weeks. For all samples with valid results from both Variant PCR and WGS, no VoC was missed by Variant PCR (totalling 399 VoC detected). Conversely, all of the samples identified as “other lineages” (i.e., “non-VoC lineages”) by the Variant PCR, were confirmed by WGS. Conclusions The Variant PCR based on the protocol by Vogels et al., is an effective method for rapid screening for VoC, applicable for most diagnostic laboratories within a pandemic setting. WGS is still required to confirm the identity of certain variants and for continuous surveillance of emerging VoC.

• Landaas, Elisabeth Toverud; Storm, Margrethe Larsdatter; Tollånes, Mette Christophersen; Barlinn, Regine; Kran, Anne-Marte Bakken & Bragstad, Karoline [Show all 8 contributors for this article] (2021). Diagnostic performance of a SARS-CoV-2 rapid antigen test in a large, Norwegian cohort. Journal of Clinical Virology. ISSN 1386-6532. 137:104789, p. 1–5. doi: 10.1016/j.jcv.2021.104789. Full text in Research Archive Show summary

  Background Rapid antigen tests (RATs) may be included in national strategies for handling the SARS-CoV-2 pandemic, as they provide test results rapidly, are easily performed outside laboratories, and enable immediate contract tracing. However, before implementation further clinical evaluation of test sensitivity is warranted. Objectives To examine the performance of Abbott’s Panbio™ COVID-19 Ag Rapid Test Device for SARS-CoV-2 testing in a low to medium prevalence setting in Norway. Study design A prospective study comparing the results of the Panbio RAT with PCR in 4857 parallel samples collected at a SARS-CoV-2 test station in Oslo, and from COVID-19 outbreaks in six Norwegian municipalities. Results A total of 4857 cases were included in the study; 3991 and 866 cases from the test station and the outbreak municipalities, respectively. The prevalence at the test station in Oslo was 6.3 %, and the overall sensitivity of the RAT was 74 %. Increased sensitivity was observed in patients who experienced symptoms (79 %) and when considering samples with viral loads above estimated level of infectivity (84 %), while it was lower in asymptomatic persons (55 %). In the outbreak municipalities, the overall prevalence was 6.9 %, and the total sensitivity of the RAT was 70 %. Conclusions Our results indicate that the test correctly identified most infectious individuals. Nevertheless, the sensitivity is considerably lower than for PCR, and it is important that the limitations of the test are kept in mind in the follow-up of tested individuals.

• Grünewald, Lena; Landaas, Elisabeth Toverud; Geissler, Julia; Weber, Heike; Quast, Carina & Röh, Simone [Show all 12 contributors for this article] (2016). Functional impact of an ADHD-associated DIRAS2 promoter polymorphism. Neuropsychopharmacology. ISSN 0893-133X. 41(13), p. 3025–3031. doi: 10.1038/npp.2016.113. Full text in Research Archive
• Landaas, Elisabeth Toverud; Aarsland, Tore Ivar Malmei; Ulvik, Arve; Halmøy, Anne; Ueland, Per Magne & Haavik, Jan (2016). Vitamin levels in adults with ADHD. BJPsych Open. doi: 10.1192/bjpo.bp.116.003491. Full text in Research Archive
• Aarsland, Tore Ivar Malmei; Landaas, Elisabeth Toverud; Hegvik, Tor-Arne; Ulvik, Arve; Halmøy, Anne & Ueland, Per Magne [Show all 7 contributors for this article] (2015). Serum concentrations of kynurenines in adult patients with attention-deficit hyperactivity disorder (ADHD): A case-control study. Behavioral and Brain Functions. 11(36). doi: 10.1186/s12993-015-0080-x. Full text in Research Archive Show summary

  Background: The essential amino acid tryptophan is catabolised mainly through the kynurenine pathway. Altered circulating levels of kynurenines have been reported in chronic inflammatory conditions and in several neuropsychiatric disorders, including depression and schizophrenia. Candidate gene studies suggest that genes related to the kynurenine catabolism may be associated with attention-deficit hyperactivity disorder (ADHD). Additionally, ADHD patients often report comorbid depression or anxiety. In this study we investigated serum levels of kynurenines in Norwegian adult ADHD patients and adult controls. Methods: We compared serum levels of tryptophan and the seven tryptophan metabolites kynurenine, kynurenic acid, anthranilic acid, 3-hydroxykynurenine, xanthurenic acid, 3-hydroxyanthranilic acid and quinolinic acid in 133 adult patients with ADHD and 131 adult controls (18–40 years). Riboflavin (vitamin B2), total vitamin B6 and the nicotine metabolite cotinine were also measured. Serum samples were analysed using mass spectrometry. Patients and controls reported comorbid disorders and past (childhood) and current ADHD symptoms using the Wender Utah Rating Scale (WURS) and the Adult ADHD Self-report Scale (ASRS). Logistic regression was used to calculate odds ratios for having an ADHD diagnosis for different serum levels of each metabolite. In addition, we used Spearman’s correlation analysis to investigate the correlation between serum levels of tryptophan and kynurenines and ADHD symptom scores. Results: Lower serum concentrations of tryptophan [odds ratio 0.61 (95 % confidence interval 0.45–0.83)], kynurenic acid [0.73 (0.53–0.99)], xanthurenic acid [0.65 (0.48–0.89)] and 3-hydroxyanthranilic acid [0.63 (0.46–0.85)], and higher levels of cotinine [7.17 (4.37–12.58)], were significantly associated with ADHD. After adjusting for tryptophan levels, only 3-hydroxyanthranilic acid and cotinine remained significant. Lower levels of tryptophan and kynurenine were also found to be correlated with higher total ASRS score and higher total WURS score, when adjusting for smoking and age. Conclusions: Our results suggest that there may be differences in serum levels of tryptophan and kynurenines between adult ADHD patients and adult controls. Although our findings do not suggest a chronic immune activation in ADHD, the underlying mechanisms and possible clinical implications of the differences should be further explored.

• Weber, Heike; Kittel-Schneider, Sarah; Heupel, Julia; Weißflog, Lena; Kent, Lindsey & Freudenberg, Florian [Show all 21 contributors for this article] (2015). On the role of NOS1 ex1f-VNTR in ADHD-allelic, subgroup, and meta-analysis. American Journal of Medical Genetics Part B: Neuropsychiatric Genetics. ISSN 1552-4841. 168(6), p. 445–458. doi: 10.1002/ajmg.b.32326. Full text in Research Archive
• Landaas, Elisabeth Toverud; Halmøy, Anne; Ødegaard, Ketil Joachim; Fasmer, Ole Bernt & Haavik, Jan (2012). The impact of cyclothymic temperament in adult ADHD. Journal of Affective Disorders. ISSN 0165-0327. 142(1-3), p. 241–247. doi: 10.1016/j.jad.2012.04.034. Full text in Research Archive
• Sánchez-Mora, Cristina; Ribases, Marta; Casas, Miquel; Bayes, Mònica; Bosch, Rosa & Fernàndez-Castillo, Noèlia [Show all 27 contributors for this article] (2011). Exploring DRD4 and its interaction with SLC6A3 as possible risk factors for adult ADHD: a meta-analysis in four european populations. American Journal of Medical Genetics. ISSN 0148-7299. 156B(5), p. 600–612. doi: 10.1002/ajmg.b.31202. Full text in Research Archive
• Landaas, Elisabeth Toverud; Johansson, Stefan; Halmøy, Anne; Ødegaard, Ketil Joachim; Fasmer, Ole Bernt & Haavik, Jan (2011). No association between the serotonin transporter gene polymorphism 5-HTTLPR and cyclothymic temperament as measured by TEMPS-A. Journal of Affective Disorders. ISSN 0165-0327. 129(1-3), p. 308–312. doi: 10.1016/j.jad.2010.08.028. Full text in Research Archive
• Landaas, Elisabeth Toverud; Johansson, Stefan; Halmøy, Anne; Ødegaard, Ketil Joachim; Fasmer, Ole Bernt & Haavik, Jan (2011). Bipolar disorder risk alleles in adult ADHD patients. Genes, Brain and Behavior. ISSN 1601-1848. 10(4), p. 418–423. doi: 10.1111/j.1601-183X.2011.00680.x. Full text in Research Archive
• Johansson, Stefan; Halmøy, Anne; Mavroconstanti, Thegna; Jacobsen, Kaya Kvarme; Landaas, Elisabeth Thoverud & Reif, Andreas [Show all 23 contributors for this article] (2010). Common variants in the TPH1 and TPH2 regions are not associated with persistent ADHD in a combined sample of 1,636 adult cases and 1,923 controls from four European populations. American Journal of Medical Genetics. ISSN 0148-7299. 153B(5), p. 1008–1015. doi: 10.1002/ajmg.b.31067. Full text in Research Archive
• Franke, Barbara; Vasquez, Alejandro Arias; Johansson, Stefan; Hoogman, Martine; Romanos, Jasmin & Boreatti-Hümmer, Andrea [Show all 33 contributors for this article] (2010). Multicenter analysis of the SLC6A3/DAT1 VNTR haplotype in persistent ADHD suggests differential involvement of the gene in childhood and persistent ADHD. Neuropsychopharmacology. ISSN 0893-133X. 35(3), p. 656–664. doi: 10.1038/npp.2009.170. Full text in Research Archive
• Landaas, Elisabeth Thoverud; Johansson, Stefan; Jacobsen, Kaya Kvarme; Ribases, Marta; Bosch, Rosa & Sánchez-Mora, Cristina [Show all 23 contributors for this article] (2010). An international multicenter association study of the serotonin transporter gene in persistent ADHD. Genes, Brain and Behavior. ISSN 1601-1848. 9(5), p. 449–458. doi: 10.1111/j.1601-183X.2010.00567.x. Full text in Research Archive
• Franke, Barbara; Vasquez, Alejandro Arias; Johansson, Stefan; Hoogman, Martine; Romanos, Jasmin & Boreatti-Hümmer, Andrea [Show all 33 contributors for this article] (2009). Multicenter analysis of the SLC6A3/DAT1 VNTR haplotype in persistent ADHD suggests differential involvement of the gene in childhood and persistent ADHD. Neuropsychopharmacology. ISSN 0893-133X. 35, p. 656–664. doi: 10.1038/npp.2009.170. Full text in Research Archive

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• Skjælaaen, Katarina; Nesvold, Helle; Brekke, Mette; Sare, Miriam; Landaas, Elisabeth Toverud & Mdala, Ibrahimu [Show all 8 contributors for this article] (2024). Seksuelt overførbare infeksjoner etter seksuelt overgrep. Full text in Research Archive
• Landaas, Elisabeth Toverud; Taxt, Arne Michael; Lind, Andreas & Müller, Fredrik (2021). Koronapandemien – erfaringer fra et mikrobiologisk laboratorium. 141(18). doi: 10.4045/tidsskr.21.0643. Full text in Research Archive
• Landaas, Elisabeth Toverud (2013). Attention-deficit/hyperactivity disorder (ADHD) in adults – Mood instability and genetic risk factors. Universitetet i Bergen. ISSN 9788230823491. Full text in Research Archive
• Landaas, Elisabeth Toverud & Haavik, Jan (2011). An international multicenter association study of the serotonin transporter gene in persistent ADHD. Universitetet i Bergen. Full text in Research Archive

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