Thomas Clausen

Image of Thomas Clausen
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Visiting address Kirkeveien 166 Bygg 45 0450 Oslo
Postal address Postboks 1039 Blindern 0315 Oslo

Academic interests

  • Treatment approaches and treatment effects in the addictions
  • Opioid maintenance treatment (OMT) as treatment for opioid addiction
  • Overdoses; causes, mechanisms and effective interventions
  • Evaluations of new interventions, with a focus on importance of “local evidence”
  • Alcohol consumption patterns and mental health in low- and middle income countries
  • Development of research methods in the drug addiction field
  • Multidisciplinary research and complimentary methods
  • Research leadership

Teaching

  • Epidemiology and terminology in the addictions
  • Research methodology and dissemination of research results
  • The treatment of drug addiction
  • Opioid maintenance treatment
  • Drug use and pregnancy
  • Overdoses and prevention
  • Treatment results and long-term outcomes
  • Compulsory treatment
  • Quality of life in the addictions

Background

Professor Thomas Clausen has his MD from the University of Oslo (2000), and earned his PhD (Dr.med.) also at the University of Oslo (2005). He has worked within the addiction field with academic duties and research as a fulltime University of Oslo employee since 2006, and as a Professor since 2010. He is the head of the research group at SERAF focusing on opioid addiction, overdoses and opioid maintenance treatment (OMT). Since 2016 he has been the Head of the Norwegian Addiction Research centre. During the academic year 2014-15 he was a Fulbright Scholar at the Alcohol Research Group (ARG) in Emeryville California, USA. Leads multiple research projects and engages in many national and international collaborations and networks.

 

https://www.researchgate.net/profile/Thomas_Clausen2

 

Appointments

Professor Clausen serves as the national expert for “drug-related-deaths”  DRD-indicator in the European Monitoring Centre for Drugs and Drug Addiction (EMCDDA) with annual representation in expert meetings in Lisbon, Portugal.

Collaborations

  • Collaboration with the World Health Organization (WHO) including projects on alcohol consumption patterns in low-and middle income countries
  • Collaboration with Europe and American partners (EUROPAD/RADARS) in a joint project monitoring drug consumption patterns among persons entering opioid drug treatment
  • Collaboration with Nordic colleagues studying overdoses, and outcomes of opioid maintenance treatment in the Nordic countries and context.
  • Ongoing collaboration with the Sørlandet Sykehus, Kristiansand, Norway for outcomes studies from drug-treatment, including coercive treatment, 12-step utilization and Opioid maintenance treatment
  • Collaboration with all regional health enterprises in Norway for ongoing annual monitoring of outcomes of opioid maintenance treatment
  • Collaboration with the Directorate for Health, Oslo and Bergen Municipalities as a joint effort to distribute nasal naloxone to drug users will be monitored by SERAF
  • Collaboration with the ARG in California on alcohol use and consequenses with a focus on low-and middle income countries

PhD-Supervision

Ongoing PhD projects:

Marianne Riksheim; Longitudinal analyses of opioid maintenance treatment outcomes

Kristine Jonassen; (Medical student-researcher) Overdoses in Oslo

Adrian Razvan Pasareanu; Coercive treatment in the addictions and long-term outcomes

Ingeborg Skjærvø; Crime and drug treatment: the NorCOMT-project

Desiree Madah-Amiri; Distribution of nasal naloxone to opioid drug users

Ashley Muller; Quality of life, social networks and drug treatment: the NorCOMT-project

Anne Bech; Mortality during Opioid Maintenance Treatment (OMT) in Norway

Completed PhD-projects

Christian Tjagvad (2016); Addictive medication in relation to drug treatment and overdose death

Ingrid A. Havnes (2015); Violence and diversion of prescribed opioids among individuals in opioid maintenance treatment. A complementary methods study of violent crime convictions in a national cohort and qualitative interviews among prisoners

Priscilla Martinez (2013); Alcohol use in special populations in Africa: Data from the World Health Survey and Study on Global AGEing and adult health

Anne Opsal (2013); Involuntarily admitted patients with substance use disorders

Anne Bukten (2012); Criminal convictions among patients in opioid maintenance treatment in Norway. A national cohort study

John-Kåre Vederhus (2012); Addiction professionals’ and substance abuse patients’ attitudes towards and usage of 12-step-based self-help groups

Linn Gjersing (2011); Staff attitudes towards opioid maintenance treatment (OMT) and the associations with treatment

Tags: Nordic, USA

Publications

  • Bjørnestad, Endre Dahlen; Vederhus, John-Kåre & Clausen, Thomas (2022). High smoking and low cessation rates among patients in treatment for opioid and other substance use disorders. BMC Psychiatry. ISSN 1471-244X. 22(1), p. 1–8. doi: 10.1186/s12888-022-04283-6.
  • Finstad, Jeanette; Clausen, Thomas; Rosseland, Leiv Arne; Røise, Olav & Havnes, Ingrid Amalia (2022). Patient experiences after physical trauma: The negative effect of the COVID-19 pandemic on recovery. International Journal of Environmental Research and Public Health (IJERPH). ISSN 1661-7827. 19:12258(19), p. 1–9. doi: 10.3390/ijerph191912258.
  • Skurtveit, Svetlana Ondrasova; Odsbu, Ingvild; Gjersing, Linn; Handal, Marte; Lid, Torgeir Gilje & Clausen, Thomas [Show all 7 contributors for this article] (2022). Individuals Dying of Overdoses Related to Pharmaceutical Opioids Differ from Individuals Dying of Overdoses Related to Other Substances: A Population-Based Register Study. European Addiction Research. ISSN 1022-6877. p. 1–6. doi: 10.1159/000526145. Full text in Research Archive
  • Skeie, Ivar; Clausen, Thomas; Hjemsæter, Arne Jan; Landheim, Anne Signe; Monsbakken, Bent Berntsen & Thoresen, Magne [Show all 7 contributors for this article] (2022). Mortality, Causes of Death, and Predictors of Death among Patients On and Off Opioid Agonist Treatment: Results from a 19-Year Cohort Study. European Addiction Research. ISSN 1022-6877. 28(5), p. 358–367. doi: 10.1159/000525694. Full text in Research Archive
  • Ericson, Øystein Bruun; Eide, Desiree; Lobmaier, Philipp Paul & Clausen, Thomas (2022). Risks and overdose responses: Participant characteristics from the first seven years of a national take-home naloxone program. Drug and Alcohol Dependence. ISSN 0376-8716. 240:109645, p. 1–7. doi: 10.1016/j.drugalcdep.2022.109645.
  • Eide, Desiree; Lobmaier, Philipp Paul & Clausen, Thomas (2022). Who is using take-home naloxone? An examination of supersavers. Harm Reduction Journal. ISSN 1477-7517. 19(1). doi: 10.1186/s12954-022-00647-z.
  • Karlsson, Ann Tarja; Vederhus, John-Kåre; Clausen, Thomas; Weimand, Bente Margrethe; Solli, Kristin Klemmetsby & Tanum, Lars Håkon Reiestad (2022). Impact of Impulsivity, Hyperactivity, and Inattention on Discontinuation Rate among Opioid-Dependent Patients Treated with Extended-Release Naltrexone. International Journal of Environmental Research and Public Health (IJERPH). ISSN 1661-7827. 19(18), p. 1–8. doi: 10.3390/ijerph191811435. Full text in Research Archive
  • Vederhus, John-Kåre; Rørendal, Malin; Skårdal, Madelene; Næss, Marianne Otterstad; Clausen, Thomas & Kristensen, Øistein (2022). Successful outcomes with low–threshold intervention for cannabis use disorders in Norway - an observational study. PLOS ONE. ISSN 1932-6203. 17(6). doi: 10.1371/journal.pone.0269988.
  • Gabrielsen, Karin Berle; Clausen, Thomas; Haugland, Siri Håvås; Hollup, Stig Arvid & Vederhus, John-Kåre (2022). Infralow neurofeedback in the treatment of substance use disorders: a randomized controlled trial. Journal of Psychiatry & Neuroscience. ISSN 1180-4882. 47(3), p. 222–229. doi: 10.1503/jpn.210202. Full text in Research Archive
  • Welle-Strand, Gabrielle; Gjersing, Linn; Olsen, Ida Keihl & Clausen, Thomas (2022). A COVID-19 Survey among People Who Use Drugs in Norway. International Journal of Environmental Research and Public Health (IJERPH). ISSN 1661-7827. 19(12), p. 1–10. doi: 10.3390/ijerph19127002. Full text in Research Archive
  • Gallefoss, Lisbeth; Gabrielsen, Karin Berle; Haugland, Siri Håvås; Clausen, Thomas & Vederhus, John-Kåre (2022). Effects of a brief pre‑admission telephone reminder on no‑show and dropout rates in substance use disorder treatment: a quasi‑experimental study. Substance Abuse Treatment, Prevention, and Policy. ISSN 1747-597X. 17(1). doi: 10.1186/s13011-022-00489-9. Full text in Research Archive
  • Mcdonald, Rebecca Silvia; Eide, Desiree; Abel-Ollo, Katri; Barnsdale, Lee; Carter, Ben & Clausen, Thomas [Show all 24 contributors for this article] (2022). A rapid assessment of take-home naloxone provision during COVID-19 in Europe. International journal of drug policy. ISSN 0955-3959. 107. doi: 10.1016/j.drugpo.2022.103787. Full text in Research Archive
  • McDonald, Rebecca; Breidahl, Sibella; Abel-Ollo, Katri; Akhtar, Shabana; Clausen, Thomas & Day, Ed [Show all 12 contributors for this article] (2022). Take-Home Naloxone Kits: Attitudes and Likelihood-Of-Use Outcomes from a European Survey of Potential Overdose Witnesses. European Addiction Research. ISSN 1022-6877. doi: 10.1159/000521197. Full text in Research Archive
  • Ericson, Øystein Bruun; Eide, Desiree; Lobmaier, Philipp Paul & Clausen, Thomas (2022). Staff preferences towards electronic data collection from a national take-home naloxone program: a cross-sectional study. Substance Abuse Treatment, Prevention, and Policy. ISSN 1747-597X. 17(1). doi: 10.1186/s13011-022-00440-y.
  • Hamina, Aleksi; Muller, Ashley Elizabeth; Clausen, Thomas; Skurtveit, Svetlana Ondrasova; Hesse, Morten & Tjagvad, Christian [Show all 11 contributors for this article] (2022). Prescription opioids among older adults: ten years of data across five countries. BMC Geriatrics. ISSN 1471-2318. 22(429). doi: 10.1186/s12877-022-03125-0. Full text in Research Archive
  • Edvardsen, Hilde Marie Erøy & Clausen, Thomas (2022). Opioid related deaths in Norway in 2000–2019. Drug and Alcohol Dependence. ISSN 0376-8716. 232. doi: 10.1016/j.drugalcdep.2022.109281.
  • Bukten, Anne; Lokdam, Nicoline; Skjærvø, Ingeborg; Ugelvik, Thomas; Skurtveit, Svetlana Ondrasova & Gabrhelík, Roman [Show all 20 contributors for this article] (2022). PriSUD-Nordic—Diagnosing and Treating Substance Use Disorders in the Prison Population: Protocol for a Mixed Methods Study. JMIR Research Protocols. ISSN 1929-0748. 11(3). doi: 10.2196/35182. Full text in Research Archive
  • Odsbu, Ingvild; Handal, Marte; Borchgrevink, Petter Chr.; Clausen, Thomas & Skurtveit, Svetlana Ondrasova (2022). Endringer i opioidbruken i Norge må tas på dypeste alvor. Tidsskrift for Den norske legeforening. ISSN 0029-2001. doi: 10.4045/tidsskr.21.0909. Full text in Research Archive
  • Odsbu, Ingvild; Handal, Marte; Hjellvik, Vidar; Borchgrevink, Petter Chr.; Clausen, Thomas & Nesvåg, Ragnar [Show all 7 contributors for this article] (2022). Vedvarende bruk av opioider og samtidig bruk av andre vanedannende legemidler. Tidsskrift for Den norske legeforening. ISSN 0029-2001. 142(3), p. 1–8. doi: 10.4045/tidsskr.21.0659. Full text in Research Archive
  • Hamina, Aleksi; Hjellvik, Vidar; Handal, Marte; Odsbu, Ingvild; Clausen, Thomas & Skurtveit, Svetlana Ondrasova (2022). Describing long-term opioid use utilizing Nordic Prescription Registers - A Norwegian example. Basic & Clinical Pharmacology & Toxicology. ISSN 1742-7835. 130(4), p. 481–491. doi: 10.1111/bcpt.13706. Full text in Research Archive
  • Saberi Zafarghandi, Mohammad Bagher; Eshrati, Sahar; Rashedi, Vahid; Vameghi, Meroe; Arezoomandan, Reza & Clausen, Thomas [Show all 7 contributors for this article] (2021). Indicators of Drug-Related Community Impacts of Open Drug Scenes: A Scoping Review. European Addiction Research. ISSN 1022-6877. doi: 10.1159/000519886.
  • Kruckow, Line; Tjagvad, Christian; Clausen, Thomas & Banner, Jytte (2021). Psychiatric disorders in a population of deceased drug users. Nordic Journal of Psychiatry. ISSN 0803-9488. doi: 10.1080/08039488.2021.1887350. Full text in Research Archive
  • Røgeberg, Ole; Bergsvik, Daniel & Clausen, Thomas (2021). Opioid overdose deaths and the expansion of opioid agonist treatment: a population-based prospective cohort study. Addiction. ISSN 0965-2140. p. 1–9. doi: 10.1111/add.15739.
  • Skjærvø, Ingeborg; Clausen, Thomas; Skurtveit, Svetlana Ondrasova & Bukten, Anne (2021). Desistance from crime following substance use treatment: the role of treatment retention, social network and self-control. BMC Psychiatry. ISSN 1471-244X. 21, p. 1–12. doi: 10.1186/s12888-021-03518-2. Full text in Research Archive
  • Bech, Anne Berit; Clausen, Thomas; Waal, Helge; Delaveris, Gerd Jorunn Møller & Skeie, Ivar (2021). Organ pathologies detected post-mortem in patients receiving opioid agonist treatment for opioid use disorder: a nation-wide 2-year cross-sectional study. Addiction. ISSN 0965-2140. p. 1–9. doi: 10.1111/add.15705. Full text in Research Archive
  • Karlsson, Ann Tarja; Vederhus, John-Kåre; Clausen, Thomas; Weimand, Bente; Solli, Kristin Klemmetsby & Tanum, Lars Håkon Reiestad (2021). Levels of impulsivity, hyperactivity, and inattention and the association with mental health and substance use severity in opioid-dependent patients seeking treatment with extended-release naltrexone. Journal of Clinical Medicine. ISSN 2077-0383. 10(19), p. 1–9. doi: 10.3390/jcm10194558. Full text in Research Archive
  • Ellingsen, Maren Mikkelsen; Clausen, Thomas; Johannesen, Sunniva Launes; Martinsen, Egil W. & Hallgren, Mats (2021). Effects of acute exercise on drug craving in adults with poly-substance use disorder. A randomized controlled trial. Mental Health and Physical Activity. ISSN 1755-2966. 21, p. 1–9. doi: 10.1016/j.mhpa.2021.100423. Full text in Research Archive
  • Hamina, Aleksi; Handal, Marte; Fredheim, Olav; Clausen, Thomas; Chen, Li-Chia & Skurtveit, Svetlana Ondrasova (2021). Filled prescriptions for opioids among children and adolescents – A nationwide study from 2010 to 2018. Acta Anaesthesiologica Scandinavica. ISSN 0001-5172. 65(10), p. 1475–1483. doi: 10.1111/aas.13968. Full text in Research Archive
  • Stenehjem, Jo Steinson; Røise, Olav; Nordseth, Trond; Clausen, Thomas; Natvig, Bård & Skurtveit, Svetlana Ondrasova [Show all 10 contributors for this article] (2021). Injury Prevention and long-term Outcomes following Trauma - The IPOT project: a protocol for prospective nationwide registry-based studies in Norway. BMJ Open. ISSN 2044-6055. 11(5). doi: 10.1136/bmjopen-2020-046954. Full text in Research Archive
  • Gabrhelík, Roman; Handal, Marte; Mravčík, Viktor; Nechanská, Blanka; Tjagvad, Christian & Thylstrup, Birgitte [Show all 12 contributors for this article] (2021). Opioid maintenance treatment in the Czech Republic, Norway and Denmark: a study protocol of a comparative registry linkage study. BMJ Open. ISSN 2044-6055. 11(5), p. 1–8. doi: 10.1136/bmjopen-2020-047028. Full text in Research Archive
  • Finstad, Jeanette; Røise, Olav; Rosseland, Leiv Arne; Clausen, Thomas & Havnes, Ingrid Amalia (2021). Discharge from the trauma centre: exposure to opioids, unmet information needs and lack of follow up—a qualitative study among physical trauma survivors. Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine. ISSN 1757-7241. 29(1), p. 1–12. doi: 10.1186/s13049-021-00938-7. Full text in Research Archive
  • Odsbu, Ingvild; Handal, Marte; Hjellvik, Vidar; Borchgrevink, Petter Chr.; Clausen, Thomas & Hamina, Aleksi [Show all 9 contributors for this article] (2021). Use of other addictive drugs among opioid users with chronic pain. Norsk Epidemiologi. ISSN 0803-2491. 29(1-2), p. 45–53. doi: 10.5324/nje.v29i1-2.4045. Full text in Research Archive
  • McDonald, Rebecca; Parkin, Stephen; Eide, Desiree Soraya; neale, joanne; Clausen, Thomas & Metrebian, Nicola [Show all 8 contributors for this article] (2021). Rethinking 'carriage' of take-home naloxone. International journal of drug policy. ISSN 0955-3959. doi: 10.1016/j.drugpo.2021.103253.
  • Hesse, Morten; Thylstrup, Birgitte; Seid, Abdu Kedir; Tjagvad, Christian & Clausen, Thomas (2021). A retrospective cohort study of medication dispensing at pharmacies: Administration matters! Drug and Alcohol Dependence. ISSN 0376-8716. 225. doi: 10.1016/j.drugalcdep.2021.108792.
  • Farhoudian, Ali; Baldacchino, Alexander; Clark, Nicolas; Gerra, Gilberto; Ekhtiari, Hamed & Dom, Geert [Show all 20 contributors for this article] (2020). COVID-19 and Substance Use Disorders: Recommendations to a Comprehensive Healthcare Response. An International Society of Addiction Medicine Practice and Policy Interest Group Position Paper. Basic and Clinical Neuroscience (BCN). ISSN 2008-126X. doi: 10.32598/bcn.11.covid19.1.
  • Borschmann, Rohan; Tibble, H; Spittal, MJ; Preen, David; Pirkis, Jane & Larney, Sarah [Show all 50 contributors for this article] (2020). The Mortality After Release from Incarceration Consortium (MARIC): Protocol for a multi-national, individual participant data meta-analysis. International Journal of Data Science (IJDS). ISSN 2053-0811. doi: 10.23889/ijpds.v5i1.1145. Full text in Research Archive
  • Medved, David; Clausen, Thomas; Bukten, Anne; Bjørnestad, Ronny & Muller, Ashley Elizabeth (2020). Large and non-specific somatic disease burdens among ageing, long-term opioid maintenance treatment patients. Substance Abuse Treatment, Prevention, and Policy. ISSN 1747-597X. 15, p. 1–9. doi: 10.1186/s13011-020-00311-4. Full text in Research Archive
  • Skurtveit, Svetlana; Hjellvik, Vidar; Sakshaug, Solveig; Borchgrevink, Petter Chr.; Larsen, Børge Myrlund & Clausen, Thomas [Show all 9 contributors for this article] (2020). Forskrivning av opioider på blå resept mot langvarige smerter. Tidsskrift for Den norske legeforening. ISSN 0029-2001. 15. doi: 10.4045/tidsskr.20.0153.
  • Welle-Strand, Gabrielle; Skurtveit, Svetlana; Clausen, Thomas; Sundal, Christine & Gjersing, Linn (2020). COVID-19 survey among people who use drugs in three cities in Norway. Drug and Alcohol Dependence. ISSN 0376-8716. 217, p. 1–4. doi: 10.1016/j.drugalcdep.2020.108302.
  • Bech, Anne Berit; Clausen, Thomas; Waal, Helge; Vindenes, Vigdis; Edvardsen, Hilde Marie Erøy & Frost, Joachim [Show all 7 contributors for this article] (2020). Postmortem toxicological analyses of blood samples from 107 patients receiving opioid agonist treatment: substances detected and pooled opioid and benzodiazepine concentrations. Addiction. ISSN 0965-2140. doi: 10.1111/add.15211. Full text in Research Archive
  • Gedeon, Charlotte; Sandell, Mikael; Birkemose, Inge; Kakko, Johan; Runarsdottir, Valgerur & Simojoki, Kaarlo [Show all 10 contributors for this article] (2019). Standards for opioid use disorder care: An assessment of Nordic approaches. Nordic Studies on Alcohol and Drugs. ISSN 1455-0725. 36(3), p. 286–298. doi: 10.1177/1455072518815322. Full text in Research Archive
  • Saberi Zafarghandi, Mohammad Bagher; Eshrati, Sahar; Vameghi, Meroe; Ranjbar, Hadi; Arezoomandan, Reza & Clausen, Thomas [Show all 7 contributors for this article] (2019). Drug-related community issues and the required interventions in open drug scenes in Tehran, Iran: a qualitative study protocol . BMJ Open. ISSN 2044-6055. 9(10), p. 1–6. doi: 10.1136/bmjopen-2019-030488. Full text in Research Archive
  • Kruckow, Line; Tjagvad, Christian; Clausen, Thomas; Linnet, Kristian & Banner, Jytte (2019). Treatment Status and Use of Psychoactive Substances in Deceased Drug Users. European Addiction Research. ISSN 1022-6877. doi: 10.1159/000503285. Full text in Research Archive
  • Opsal, Anne; Kristensen, Øistein & Clausen, Thomas (2019). Readiness to change among involuntarily and voluntarily admitted patients with substance use disorders. Substance Abuse Treatment, Prevention, and Policy. ISSN 1747-597X. 14(1). doi: 10.1186/s13011-019-0237-y. Full text in Research Archive
  • Stavseth, Marianne Riksheim; Clausen, Thomas & Røislien, Jo (2019). The clinical consequences of variable selection in multiple regression models: a case study of the Norwegian Opioid Maintenance Treatment program. The American Journal of Drug and Alcohol Abuse. ISSN 0095-2990. doi: 10.1080/00952990.2019.1648484. Full text in Research Archive
  • Bukten, Anne; Stavseth, Marianne Riksheim & Clausen, Thomas (2019). From restrictive to more liberal: variations in mortality among patients in opioid maintenance treatment over a 12-year period. BMC Health Services Research. ISSN 1472-6963. 19(1). doi: 10.1186/s12913-019-4382-9. Full text in Research Archive
  • Stavseth, Marianne Riksheim; Clausen, Thomas & Røislien, Jo (2019). How handling missing data may impact conclusions: A comparison of six different imputation methods for categorical questionnaire data. SAGE Open Medicine. ISSN 2050-3121. 7, p. 1–12. doi: 10.1177/2050312118822912. Full text in Research Archive
  • Bech, Anne Berit; Clausen, Thomas; Waal, Helge; Saltyte Benth, Jurate & Skeie, Ivar (2019). Mortality and causes of death among patients with opioid use disorder receiving opioid agonist treatment: A national register study. BMC Health Services Research. ISSN 1472-6963. 19. doi: 10.1186/s12913-019-4282-z. Full text in Research Archive
  • Muller, Ashley Elizabeth; Skurtveit, Svetlana & Clausen, Thomas (2019). Confirming the factor structure of a generic quality of life instrument among pre-treatment substance use disorder patients . Health and Quality of Life Outcomes. ISSN 1477-7525. 17. doi: 10.1186/s12955-019-1152-7. Full text in Research Archive
  • Muller, Ashley Elizabeth; Skurtveit, Svetlana & Clausen, Thomas (2019). Performance of the WHOQOL-BREF among Norwegian substance use disorder patients. BMC Medical Research Methodology. ISSN 1471-2288. 19(44), p. 1–9. doi: 10.1186/s12874-019-0690-3. Full text in Research Archive
  • Muller, Ashley Elizabeth; Clausen, Thomas; Sjøgren, Per; Odsbu, Ingvild & Skurtveit, Svetlana (2019). Prescribed opioid analgesic use developments in three Nordic countries, 2006-2017. Scandinavian Journal of Pain. ISSN 1877-8860. 19(2). doi: 10.1515/sjpain-2018-0307. Full text in Research Archive
  • Madah-Amiri, Desiree; Gjersing, Linn Renathe & Clausen, Thomas (2019). Naloxone distribution and possession following a large-scale naloxone programme. Addiction. ISSN 0965-2140. 114(1), p. 92–100. doi: 10.1111/add.14425. Full text in Research Archive
  • Birke, Hanne; Ekholm, Ola; Sjøgren, Per; Fredheim, Olav Magnus; Clausen, Thomas & Skurtveit, Svetlana (2019). Tramadol use in Norway: A register-based population study. Pharmacoepidemiology and Drug Safety. ISSN 1053-8569. 28(1), p. 54–61. doi: 10.1002/pds.4626. Full text in Research Archive
  • Towers, Andy; Szabo, Agnes; Newcombe, David A L; Sheridan, Janie; Moore, Alison & Hyde, Martin [Show all 12 contributors for this article] (2018). Hazardous Drinking Prevalence and Correlates in Older New Zealanders: A Comparison of the AUDIT-C and the CARET. Journal of Aging and Health. ISSN 0898-2643. doi: 10.1177/0898264318794108. Full text in Research Archive
  • Madah-Amiri, Desiree; Skulberg, Arne Kristian; Næss, Anne-Cathrine Braarud; Dale, Ola; Heyerdahl, Fridtjof & Lobmaier, Philipp Paul [Show all 7 contributors for this article] (2018). Ambulance-attended opioid overdoses: An examination into overdose locations and the role of a safe injection facility. Substance Abuse. ISSN 0889-7077. doi: 10.1080/08897077.2018.1485130. Full text in Research Archive
  • Kakko, Johan; Gedeon, Charlotte; Sandell, Mikael; Grelz, Henrik; Birkemose, Inge & Clausen, Thomas [Show all 11 contributors for this article] (2018). Principles for managing OUD related to chronic pain in the Nordic countries based on a structured assessment of current practice. Substance Abuse Treatment, Prevention, and Policy. ISSN 1747-597X. 13(1). doi: 10.1186/s13011-018-0160-7. Full text in Research Archive
  • Muller, Ashley Elizabeth; Bjørnestad, Ronny & Clausen, Thomas (2018). Dissatisfaction with opioid maintenance treatment partly explains reported side effects of medications. Drug and Alcohol Dependence. ISSN 0376-8716. 187, p. 22–28. doi: 10.1016/j.drugalcdep.2018.02.018.
  • Abel, Eli Kristine Fiksdal; Skjærvø, Ingeborg; Ravndal, Edle; Clausen, Thomas & Bramness, Jørgen Gustav (2018). Perceived Self-Control is Related to Mental Distress in Patients Entering Substance Use Disorder Treatment. Substance Use & Misuse. ISSN 1082-6084. 53(9), p. 1454–1462. doi: 10.1080/10826084.2017.1413114.
  • Skjærvø, Ingeborg; Clausen, Thomas; Skurtveit, Svetlana; Abel, Eli Kristine Fiksdal & Bukten, Anne (2018). Similarities and Differences in Victimization Risk Factors for Nonoffending and Offending Substance Users. Victims & Offenders. ISSN 1556-4886. 13(4), p. 526–541. doi: 10.1080/15564886.2017.1383332. Full text in Research Archive
  • Abel, Eli Kristine Fiksdal; Ravndal, Edle; Clausen, Thomas & Bramness, Jørgen Gustav (2017). Attention Deficit Hyperactivity Disorder Symptoms are Common in Patients in Opioid Maintenance Treatment. European Addiction Research. ISSN 1022-6877. 23(6), p. 298–305. doi: 10.1159/000484240. Full text in Research Archive
  • Edvardsen, Hilde Marie Erøy; Tverborgvik, Torill; Frost, Joachim; Rogde, Sidsel; Morild, Inge & Waal, Helge [Show all 9 contributors for this article] (2017). Differences in combinations and concentrations of drugs of abuse in fatal intoxication and driving under the influence cases. Forensic Science International. ISSN 0379-0738. 281, p. 127–133. doi: 10.1016/j.forsciint.2017.10.045. Full text in Research Archive
  • Muller, Ashley Elizabeth; Skurtveit, Svetlana & Clausen, Thomas (2017). Building abstinent networks is an important resource in improving quality of life. Drug and Alcohol Dependence. ISSN 0376-8716. 180, p. 431–438. doi: 10.1016/j.drugalcdep.2017.09.006. Full text in Research Archive
  • Stavseth, Marianne Riksheim; Røislien, Jo; Bukten, Anne & Clausen, Thomas (2017). Factors associated with ongoing criminal engagement while in opioid maintenance treatment. Journal of Substance Abuse Treatment. ISSN 0740-5472. 77, p. 52–56. doi: 10.1016/j.jsat.2017.03.010. Full text in Research Archive
  • Pasareanu, Adrian Razvan; Vederhus, John-Kåre; Opsal, Anne; Kristensen, Øistein & Clausen, Thomas (2017). Mental distress following inpatient substance use treatment, modified by substance use; comparing voluntary and compulsory admissions. BMC Health Services Research. ISSN 1472-6963. 17:5, p. 1–9. doi: 10.1186/s12913-016-1936-y. Full text in Research Archive
  • Madah-Amiri, Desiree; Clausen, Thomas & Lobmaier, Philipp Paul (2017). Rapid widespread distribution of intranasal naloxone for overdose prevention. Drug and Alcohol Dependence. ISSN 0376-8716. 173, p. 17–23. doi: 10.1016/j.drugalcdep.2016.12.013. Full text in Research Archive
  • Bukten, Anne; Stavseth, Marianne Riksheim; Skurtveit, Svetlana; Tverdal, Aage; Strang, John & Clausen, Thomas (2017). High risk of overdose death following release from prison: variations in mortality during a 15-year observation period. Addiction. ISSN 0965-2140. 112(8), p. 1432–1439. doi: 10.1111/add.13803. Full text in Research Archive
  • Stallvik, Marianne & Clausen, Thomas (2017). HRQoL and its association to clinical severity and treatment needs. Journal of Substance Use. ISSN 1465-9891. 22(5), p. 524–530. doi: 10.1080/14659891.2016.1259366. Full text in Research Archive
  • Skjærvø, Ingeborg; Skurtveit, Svetlana; Clausen, Thomas & Bukten, Anne (2017). Substance use pattern, self‐control and social network are associated with crime in a substance‐using population. Drug and Alcohol Review. ISSN 0959-5236. 36(2), p. 245–252. doi: 10.1111/dar.12406. Full text in Research Archive
  • Madah-Amiri, Desiree; Clausen, Thomas; Myrmel, Lars; Brattebø, Guttorm & Lobmaier, Philipp Paul (2017). Circumstances surrounding non-fatal opioid overdoses attended by ambulance services. Drug and Alcohol Review. ISSN 0959-5236. 36(3), p. 288–294. doi: 10.1111/dar.12451. Full text in Research Archive
  • Gjersing, Linn Renathe; Vinge-Holmquist, Kristine; Skurtveit, Svetlana; Bramness, Jørgen Gustav & Clausen, Thomas (2017). Emergency service use is common in the year before death among drug users who die from an overdose. Journal of Substance Use. ISSN 1465-9891. 22(3), p. 331–336. doi: 10.1080/14659891.2016.1208778. Full text in Research Archive
  • Opsal, Anne; Kristensen, Øistein; Vederhus, John-Kåre & Clausen, Thomas (2016). Perceived coercion to enter treatment among involuntarily and voluntarily admitted patients with substance use disorders. BMC Health Services Research. ISSN 1472-6963. 16(1), p. 1–10. doi: 10.1186/s12913-016-1906-4. Full text in Research Archive

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  • Hamina, Aleksi; Odsbu, Ingvild; Clausen, Thomas & Skurtveit, Svetlana Ondrasova (2022). Intentional overdoses and associated mental health challenges, an overlooked sub-population of overdoses.
  • Hamina, Aleksi; Odsbu, Ingvild; Hjellvik, Vidar; Gjersing, Linn; Lid, Torgeir Gilje & Clausen, Thomas [Show all 7 contributors for this article] (2022). Fatal overdoses in a cohort of chronic pain patients.
  • Skurtveit, Svetlana Ondrasova & Clausen, Thomas (2022). Flere kvinner dør av smertestillende piller. Aftenposten.
  • Uleberg, Oddvar; Kristiansen, Thomas; Nordseth, Trond; Stenehjem, Jo S.; Gran, Jon Michael & Clausen, Thomas [Show all 8 contributors for this article] (2022). Skader etter vold og ulykker - den glemte pandemi? Tidsskrift for Den norske legeforening. ISSN 0029-2001. 142(8). doi: 10.4045/tidsskr.22.0261.
  • Clausen, Thomas (2022). OxyContin: – Det er jeg som hører at hun gråter om natten . [Internet]. NRK Nyheter.
  • Clausen, Thomas (2022). Dagsrevyen Avhengig av medisiner . [TV]. NRK Dagsrevyen.
  • Uleberg, Oddvar; Stenehjem, Jo S.; Nordseth, Trond; Clausen, Thomas; Natvig, Bård & Skurtveit, Svetlana Ondrasova [Show all 12 contributors for this article] (2022). The injury prevention and outcomes following trauma (IPOT) project: is a nationwide registry-based study in Norway feasible?
  • Stenehjem, Jo S.; Røise, Olav; Nordseth, Trond; Clausen, Thomas; Natvig, Bård & Skurtveit, Svetlana Ondrasova [Show all 12 contributors for this article] (2021). Injury Prevention and long-term Outcomes following Trauma - the IPOT project: a protocol for prospective nationwide registry-based studies in Norway.
  • Rosseland, Leiv Arne; Stenehjem, Jo S.; Nordseth, Trond; Clausen, Thomas; Natvig, Bård & Skurtveit, Svetlana Ondrasova [Show all 12 contributors for this article] (2021). The Injury Prevention and Outcomes following Trauma project: a prospective nationwide registry-based study in Norway.
  • Muller, Ashley Elizabeth; Bukten, Anne & Clausen, Thomas (2019). How can we measure the quality of life of high-risk groups in Norway? Scandinavian Journal of Public Health. ISSN 1403-4948. 47, p. 10–10. Full text in Research Archive
  • Opsal, Anne; Kristensen, Øistein & Clausen, Thomas (2019). Perceived coercion to enter treatment among involuntarily and voluntarily admitted patients with substance use disorders .
  • Muller, Ashley Elizabeth; Medved, David & Clausen, Thomas (2018). Long-term opioid maintenance treatment patients and the role of benzodiazepines.
  • Muller, Ashley Elizabeth; Odsbu, Ingvild; Sjøgren, Per; Clausen, Thomas & Skurtveit, Svetlana (2018). Prescribed opioid analgesic use developments in the Scandinavian countries, 2006-2017.
  • Medved, David; Clausen, Thomas & Muller, Ashley Elizabeth (2018). Disease burden in ageing long-term opioid maintenance treatment patients; the triple burden.
  • Muller, Ashley Elizabeth & Clausen, Thomas (2018). Somatic health challenges among opioid maintenance treatment patients.
  • Kristensen, Øistein; Opsal, Anne & Clausen, Thomas (2018). Tvangsinnleggelse for rusbehandling? Tidsskrift for Den norske legeforening. ISSN 0029-2001. 138(8). doi: 10.4045/tidsskr.17.1114.
  • Edvardsen, Hilde Marie Erøy; Tverborgvik, Torill; Frost, Joachim; Rogde, Sidsel; Morild, Inge & Waal, Helge [Show all 9 contributors for this article] (2018). Corrigendum to "Differences in combinations and concentrations of drugs of abuse in fatal intoxication and driving under the influence cases". Forensic Science International. ISSN 0379-0738. 283, p. 219–219. doi: 10.1016/j.forsciint.2017.12.040.
  • Muller, Ashley Elizabeth & Clausen, Thomas (2017). Social network changes predict adherence to opioid maintenance treatment .
  • Muller, Ashley; Clausen, Thomas & Skurtveit, Svetlana (2017). Building an abstinent network to support quality of life gains through treatment.
  • Bukten, Anne; Lokdam, Nicoline; Clausen, Thomas & Skjærvø, Ingeborg (2021). Bruk, besittelse og ruspåvirket kjøring blant innsatte i Norske fengsel 2000-2019. Senter for rus og avhengighetsforskning (SERAF).
  • Lobmaier, Philipp Paul; Skeie, Ivar; Lillevold, Pål Henrik; Bussesund, Kari; Waal, Helge & Clausen, Thomas (2020). Statusrapport 2019 Nye medisiner - nye muligheter? SERAF RAPPORT 1/2020.
  • Eide, Desiree Soraya; Muller, Ashley Elizabeth & Clausen, Thomas (2019). Behandling av opioiddominert ruslidelse: et prøveprosjekt med heroinassistert behandling. Senter for rus- og avhengighetsforskning (SERAF).
  • Stavseth, Marianne Riksheim; Clausen, Thomas & Røislien, Jo (2019). Annual assessment data from the Norwegian opioid maintenance programme: A methodological perspective. Det medisinske fakultet, Universitet i Oslo. ISSN 978-82-8377-460-3.
  • Edvardsen, Hilde Marie Erøy; Rogde, Sidsel; Clausen, Thomas & Vindenes, Vigdis (2018). GHB-, fentanyl- og oksykodonrelaterte dødsfall. Avdeling for rettsmedisinske fag, Oslo Universitetssykehus og Senter for rus- og avhengighetsforskning, Universitetet i Oslo.
  • Skjærvø, Ingeborg; Bukten, Anne; Skurtveit, Svetlana & Clausen, Thomas (2018). Substance use and crime - Characteristics of victim and offender roles in a longitudinal study of patients entering substance use treatment. Universitetet i Oslo. ISSN 978-82-8377-250-0.
  • Madah-Amiri, Desiree; Clausen, Thomas & Lobmaier, Philipp Paul (2017). Opioid overdoses and overdose prevention: The establishment of take-home naloxone in Norway. Universitetet i Oslo. ISSN 978-82-8377-110-7.
  • Muller, Ashley Elizabeth; Skurtveit, Svetlana & Clausen, Thomas (2017). Quality of life, substance use disorders, and social lives: Exploring one-year outcomes and intrinsic links. University of Oslo. ISSN 978-82-8377-139-8. Full text in Research Archive
  • Tjagvad, Christian; Clausen, Thomas & Skurtveit, Svetlana (2016). Addictive medication in relation to drug treatment and overdose death. Faculty of Medicine, University of Oslo. ISSN 978-82-8333-308-4. Full text in Research Archive

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Published Apr. 13, 2011 2:55 PM - Last modified Jan. 11, 2017 4:57 PM