Marja Leonhardt

Social media use, gaming and quality of life among adolescents in Norway: results from the Young-HUNT study 2025 Health and Quality of Life Outcomes - Annette Løvheim Kleppang, Curt Hagquist, Tonje Holte Stea, Marja Leonhardt, Tore Bonsaksen, Lars Lien, Anne Mari Steigen

Prescription of Psychotropic Drugs in Persons With Concurrent Severe Mental Illness and Substance Use Disorders Before and During the COVID-19 Pandemic in Norway — A Nationwide Register Study 2025 International Journal of Mental Health and Addiction - Marja Leonhardt, Jørgen Gustav Bramness, Ingeborg Hartz, Lars Lien

Promoting Sustained Real-Life Benefits of Virtual Reality–Based Interventions in People With Mental Health and Substance Use Disorders: Qualitative Study 2025 JMIR Formative Research - Jan Aasen, Fredrik Nilsson, Torgeir Sørensen, Marja Leonhardt

Mental health and energy drink consumption among Norwegian adolescents; a cross-sectional study 2025 BMC Public Health - Siri Kaldenbach, Marja Leonhardt, Tor Arne Strand, Mads Nikolaj Holten-Andersen

Barriers and facilitators to social participation in people with mental health and substance use disorders: a formative qualitative study 2024 Advances in Dual Diagnosis: Policy, practice and research in mental health and substance use - Jan Aasen, Fredrik Nilsson, Torgeir Sørensen, Lars Lien, Marja Leonhardt

Are social pressure, bullying and low social support associated with depressive symptoms, self-harm and self-directed violence among adolescents? A cross-sectional study using a structural equation modeling approach 2024 BMC Psychiatry - Tonje Holte Stea, Tore Bonsaksen, Pierre Smith, Annette Løvheim Kleppang, Anne Mari Steigen, Marja Leonhardt, Lars Lien, Mario Vianna Vettore

Use of contraception during first sexual intercourse among Norwegian adolescents: a national cross-sectional study 2024 BMC Public Health - Live Solveig Nordhagen, Hilde Egge, Marja Leonhardt

Frequency and patterns of substance-induced psychosis in persons with concurrent mental health and substance use disorders during the COVID-19 pandemic: A Norwegian register-based cohort study 2024 European psychiatry - Marja Leonhardt, Jørgen Gustav Bramness, Eline Rognli, Lars Lien

Health assessments of refugee minors arriving in Norway – a modified Delphi study among health professionals in primary care settings 2024 BMC Public Health - Cecilie Ruud Dangmann, Annette Løvheim Kleppang, Marja Leonhardt

Gutters tanker og følelser om egen kropp og utseende – en kvalitativ studie 2024 Sykepleien Forskning - Inger Christine Krath Hansen Hansen, Live Solveig Nordhagen, Marja Leonhardt

Incidence of SARS-CoV-2 and all-cause mortality in persons with co-occurring substance use disorder and mental illness during the pandemic: a Norwegian cohort study 2023 Social Psychiatry and Psychiatric Epidemiology - Marja Leonhardt, Jørgen Gustav Bramness, Lars Lien

Time trends in self-reported depressive symptoms, prescription of antidepressants, sedatives and hypnotics and the emergence of social media among Norwegian adolescents 2023 PLOS ONE - Lars Lien, Tore Bonsaksen, Tonje Holte Stea, Annette Løvheim Kleppang, Anne Mari Steigen, Marja Leonhardt

Promoting Social Participation and Recovery Using Virtual Reality–Based Interventions Among People With Mental Health and Substance Use Disorders: Qualitative Study 2023 JMIR Formative Research - Jan Aasen, Kari Galaaen, Fredrik Nilsson, Torgeir Sørensen, Lars Lien, Marja Leonhardt

Negative social media-related experiences and lower general self-efficacy are associated with depressive symptoms in adolescents 2023 Frontiers in Public Health - Tore Bonsaksen, Anne Mari Steigen, Tonje Holte Stea, Annette Løvheim Kleppang, Lars Lien, Marja Leonhardt

Education and Training in Addiction Medicine and Psychology across Europe: A EUFAS Survey 2023 European Addiction Research - Jørgen Gustav Bramness, Marja Leonhardt, Geert Dom, Albert Batalla, Gerardo Flórez Menéndez, Karl Mann, Friedrich Martin Wurst, Marcin Wojnar, Colin Drummond, Emanuele Scafato, Antoni Gual, Cristina Maria Ribeiro, Olivier Cottencin, Ulrich Frischknecht, Benjamin Rolland

Associations between Mental Health, Lifestyle Factors and Worries about Climate Change in Norwegian Adolescents 2022 International Journal of Environmental Research and Public Health (IJERPH) - Marja Leonhardt, Marie Dahlen Granrud, Tore Bonsaksen, Lars Lien

Is There an Association between Intra-Operative Detection of Pathogens in Subcutaneous Tissue and Surgical Site Infections? Results from a Prospective Study 2022 Surgical Infections - Rahel M Strobel, Rasmus Leistner, Marja Leonhardt, Konrad Neumann, Sophie M Eschlböck, Lucas D.G. Lee, Claudia Seifarth, Christian H.W. Schineis, Carsten Kamphues, Benjamin Weixler, Katharina Beyer, Johannes C Lauscher

Norwegian Cross-Cultural Adaptation of the Social and Communities Opportunities Profile-Mini for Persons with Concurrent Mental Health and Substance Use Disorders 2022 Journal of Psychosocial Rehabilitation and Mental Health - Marja Leonhardt, Ellen Kyrdalen, Atle Holstad, Heidi Hurlen-Solbakken, Marcus Y.-L. Chiu, Lars Lien

Hvem kan jeg tale med? Et kvalitativt studie af hvem unge taler med, når de har problemer 2022 Klinisk Sygepleje - Signe Zenia Hulgaard-Bruvold, Marja Leonhardt

Therapists and the Topic of Meaning in Life in Their Encounters With Adolescents With Developmental Trauma: A Qualitative Study 2022 Frontiers in Psychiatry - Kjersti Olstad, Lars Lien, Marja Leonhardt, Torgeir Sørensen, Lars Johan Danbolt

Risk factors for cardiovascular disease among people with mental illness in Namibia 2022 Ghana Medical Journal - Ndahambelela Frederika Nepando Mthoko, Lilian Pazvakawambwa, Marja Leonhardt, Lars Lien

How did the first COVID-19 lockdown affect persons with concurrent mental health and substance use disorders in Norway? A qualitative study 2022 BMC Psychiatry - Marja Leonhardt, Morten Brodahl, Nicola Cogan, Lars Lien

Association between cannabis use and physical health problems in Norwegian adolescents: a cross-sectional study from the youth survey Ungdata 2022 BMC Public Health - Ragnhild Mæland, Lars Lien, Marja Leonhardt

Sleep and energy drink consumption among Norwegian adolescents – a cross-sectional study 2022 BMC Public Health - Siri Kaldenbach, Marja Leonhardt, Lars Lien, Asborg Sine Aanstad Bjertnæs, Tor Arne Strand, Mads Nikolaj Holten-Andersen

Covid-19: Kontakt med helsesykepleier i skolehelsetjenesten under første nedstengning – en tverrsnittsstudie 2021 Sykepleien Forskning - Marie Dahlen Granrud, Marja Leonhardt

Are There Differences in Video Gaming and Use of Social Media among Boys and Girls?—A Mixed Methods Approach 2021 International Journal of Environmental Research and Public Health (IJERPH) - Marja Leonhardt, Stian Overå

The relationship between religiosity/spirituality and quality of life among female Eritrean refugees living in Norwegian asylum centres. 2021 International Journal of Social Psychiatry - Ruth Abraham, Marja Leonhardt, Lars Lien, Ingrid Hanssen, Edvard Hauff, Suraj Bahadur Thapa

The impact of surgical site infection—a cost analysis 2021 Langenbeck's Archives of Surgery - Rahel M Strobel, Marja Leonhardt, Frank Forster, Konrad Neumann, Leonard A Lobbes, Claudia Seifarth, Lucas D Lee, Christian HW Schineis, Carsten Kamphues, Benjamin Weixler, Martin E. Kreis, Johannes C Lauscher

Comparison of European Clinical Guidelines on the Management of Alcohol Use Disorders 2020 European Addiction Research - Colin Drummond, Miriam Hillyard, Marja Leonhardt, Frieder Wurst, Geert Dom, Karl Mann, Jørgen Gustav Bramness

Validation of the German Classification of Diverticular Disease (VADIS)-a prospective bicentric observational study 2020 International Journal of Colorectal Disease - Johannes C Lauscher, Johan F. Lock, Katja Aschenbrenner, Rahel M Strobel, Marja Leonhardt, Andrea Stroux, Benjamin Weixler, Christoph T Germer, Martin E. Kreis

Sources of Support and Information During Disease: An Exploratory Study, Comparing Migrant and Nonmigrant Colorectal Cancer Patients in Germany 2020 Journal of Transcultural Nursing - Marja Leonhardt, Katja Aschenbrenner, Joern Groene, Martin E. Kreis, Johannes C Lauscher

Reduction of Postoperative Wound Infections by Antiseptica (RECIPE)?: A Randomized Controlled Trial. 2019 Annals of Surgery - Rahel Strobel, Marja Leonhardt, A Krochmann, K Neumann, F Speichinger, L Hartmann, LD Lee, K Beyer, S Daum, ME Kreis, JC Lauscher

Does migrant background predict to what extent colorectal cancer patients want to be informed about their life expectancy? – a cross-sectional analysis 2019 International Journal for Equity in Health - Marja Leonhardt, Katja Aschenbrenner, Martin E. Kreis, Johannes C Lauscher

Fargerikt og grønt - innvandrere og friluftsliv NaKuHel og folkehelse som bærekraft: Samspillet Natur-Kultur-Helse sett i lys av FNs bærekraftmål 2019 - Marja Leonhardt, Lars Lien

Exploring the characteristics and potential disparities of non-migrant and migrant colorectal cancer patients regarding their satisfaction and subjective perception of care - A cross-sectional study 2018 BMC Health Services Research - Marja Leonhardt, Katja Aschenbrenner, Martin E. Kreis, Johannes C Lauscher

Watchful waiting vs surgical repair of oligosymptomatic incisional hernias : Current status of the AWARE study 2015 Der Chirurg - Johannes C Lauscher, Marja Leonhardt, Peter Martus, Gerrit Zur Hausen, Katja Aschenbrenner, Ute Zur Buchen, Henryk Thielemann, Tobias Kohlert, Rebecca Schirren, Thomas Simon, H J Buhr, J P Ritz, Martin E. Kreis

Cross-cultural adaptation of the delphi definitions of low back pain prevalence (German DOLBaPP) 2014 BMC Musculoskeletal Disorders - Marja Leonhardt, Falk Liebers, Clermont E. Dionne, Ute Latza

Prescription of psychotropic drugs in persons with concurrent mental health and substance use disorders before and during the COVID-19 pandemic in Norway 2025 European psychiatry - Marja Leonhardt, Lars Lien

Helseundersøkelser av nyankomne barn og unge med fluktbakgrunn 2024 Helsesykepleierkongressen 2024 - Cecilie Ruud Dangmann, Annette Løvheim Kleppang, Marja Leonhardt

The use of VR to promote social participation in people with mental health and substance use disorders: a randomized controlled trial 2024 Nordic VR forum - Anne Berit Bech, Marja Leonhardt, Lars Lien

The use of VR to promote social participation in people with mental health or substance use disorderes: protocol for a randomized controlled trial 2024 Nordic VR Forum - Marja Leonhardt, Lars Lien

Negative social media experiences and lower self-efficacy are associated with depressive symptoms 2023 16th European Public Health Conference - Tore Bonsaksen, Anne Mari Steigen, Tonje Holte Stea, Annette Løvheim Kleppang, Lars Lien, Marja Leonhardt

Assessment of mental health and psychosocial support in Ukrainian refugee minors resettled in Norway 2022 European Public Health Conference - Cecilie Ruud Dangmann, Marja Leonhardt, Annette Løvheim Kleppang, Lars Lien

En bedre hverdag ved hjelp av VR-teknologi – et blikk inn i fremtiden 2022 NAPHA-konferansen 2022 – Meningsfull hverdag - Marja Leonhardt

Hvordan kan VR bidra til at mennesker med en rus og psykisk lidelse deltar i samfunn? 2022 Fra utenforskap til medborgerskap - Fagsamling - Marja Leonhardt

Physical comorbidity among patients attending mental health services at Windhoek Central Hospital, Namibia 2022 Pan African Medical Journal - Ndahambelela Frederika Nepando Mthoko, Lilian Pazvakawambwa, Marja Leonhardt, Lars Lien

The impact of COVID-19 on persons with concurrent mental health and substance use disorders 2022 European Journal of Public Health - Marja Leonhardt

Ungdommers bekymringer og bruk av skolehelsetjenesten under pandemien. 2022 Folkehelsekonferansen - Marie Dahlen Granrud, Marja Leonhardt

Worries about climate change in Norwegian adolescents 2022 European Public Health Conference - Marja Leonhardt, Marie Dahlen Granrud, Tore Bonsaksen, Lars Lien

Virtual reality as a facilitator for participation in society among persons with mental health and substance use disorders. 2021 Nordic VR Forum - Marja Leonhardt

Gaming: ungdom og digitale fellesskap 2020 Kontekstonline - Stian Overå, Marja Leonhardt

Ungdom i koronatiden: Resultater fra ungdomsundersøkelse under korona-lockdown 2020 - Marja Leonhardt, Mari Evenby Finstad, Stian Overå, Olav Niri Talberg

Reduktion postoperativer Wundinfektionen durch Antiseptika (RECIPE)? – eine randomisiert-kontrollierte Studie 2019 Zeitschrift für Gastroenterologie - German Journal of Gastroenterology - Johannes C Lauscher, Rahel Strobel, Marja Leonhardt, A Krochmann, K Neumann, F Speichinger, L Hartmann, L Lee, Katharina Bayer, S Daum, Martin E. Kreis

Social Gradients in Alcohol Use Disorders with and without Depression: Immigrants vs Norwegians 2019 The European Journal of Public Health - Marja Leonhardt, Dawit Shawel Abebe

Ungdom og doping Bruk, tilgjengelighet og anskaffelse av dopingmidler blant norske 13–18-åringer 2019 - Marja Leonhardt, Overå Stian

Support and information sources during disease – focusing on migrant patients in Germany 2018 The European Journal of Public Health - Marja Leonhardt