Publications 2024

Dangmann C, Kleppang AL, Leonhardt M (2024)
Health assessments of refugee minors arriving in Norway - a modified Delphi study among health professionals in primary care settings
BMC Public Health, 24 (1), 2487
DOI 10.1186/s12889-024-19871-2, PubMed 39267001

Leonhardt M, Bramness JG, Rognli EB, Lien L (2024)
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
Eur Psychiatry, 67 (1), e82
DOI 10.1192/j.eurpsy.2024.1797, PubMed 39676544

Lien L, Bonsaksen T, Stea TH, Kleppang AL, Steigen AM, Leonhardt M (2024)
Correction: Time trends in self-reported depressive symptoms, prescription of antidepressants, sedatives and hypnotics and the emergence of social media among Norwegian adolescents
PLoS One, 19 (7), e0306972
DOI 10.1371/journal.pone.0306972, PubMed 38968263

Nordhagen LS, Egge H, Leonhardt M (2024)
Use of contraception during first sexual intercourse among Norwegian adolescents: a national cross-sectional study
BMC Public Health, 24 (1), 1521
DOI 10.1186/s12889-024-19009-4, PubMed 38844901

Stea TH, Bonsaksen T, Smith P, Kleppang AL, Steigen AM, Leonhardt M, Lien L, Vettore MV (2024)
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
BMC Psychiatry, 24 (1), 239
DOI 10.1186/s12888-024-05696-1, PubMed 38553669

Publications 2023

Bonsaksen T, Steigen AM, Stea TH, Kleppang AL, Lien L, Leonhardt M (2023)
Negative social media-related experiences and lower general self-efficacy are associated with depressive symptoms in adolescents
Front Public Health, 10, 1037375
DOI 10.3389/fpubh.2022.1037375, PubMed 36684882

Bramness JG, Leonhardt M, Dom G, Batalla A, Flórez Menéndez G, Mann K, Wurst FM, Wojnar M, Drummond C, Scafato E, Gual A, Ribeiro CM, Cottencin O, Frischknecht U, Rolland B (2023)
Education and Training in Addiction Medicine and Psychology across Europe: A EUFAS Survey
Eur Addict Res, 30 (3), 127-137
DOI 10.1159/000531502, PubMed 37557089

Leonhardt M, Bramness JG, Lien L (2023)
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
Soc Psychiatry Psychiatr Epidemiol, 59 (8), 1379-1387
DOI 10.1007/s00127-023-02599-6, PubMed 38015236

Lien L, Bonsaksen T, Holte Stea T, Kleppang AL, Steigen AM, Leonhardt M (2023)
Time trends in self-reported depressive symptoms, prescription of antidepressants, sedatives and hypnotics and the emergence of social media among Norwegian adolescents
PLoS One, 18 (12), e0295384
DOI 10.1371/journal.pone.0295384, PubMed 38150420

Aasen J, Galaaen K, Nilsson F, Sørensen T, Lien L, Leonhardt M (2023)
Promoting Social Participation and Recovery Using Virtual Reality-Based Interventions Among People With Mental Health and Substance Use Disorders: Qualitative Study
JMIR Form Res, 7, e46136
DOI 10.2196/46136, PubMed 37104000

Publications 2022

Kaldenbach S, Leonhardt M, Lien L, Bjærtnes AA, Strand TA, Holten-Andersen MN (2022)
Sleep and energy drink consumption among Norwegian adolescents - a cross-sectional study
BMC Public Health, 22 (1), 534
DOI 10.1186/s12889-022-12972-w, PubMed 35303832

Leonhardt M, Brodahl M, Cogan N, Lien L (2022)
How did the first COVID-19 lockdown affect persons with concurrent mental health and substance use disorders in Norway? A qualitative study
BMC Psychiatry, 22 (1), 179
DOI 10.1186/s12888-022-03812-7, PubMed 35287637

Leonhardt M, Granrud MD, Bonsaksen T, Lien L (2022)
Associations between Mental Health, Lifestyle Factors and Worries about Climate Change in Norwegian Adolescents
Int J Environ Res Public Health, 19 (19)
DOI 10.3390/ijerph191912826, PubMed 36232127

Mthoko NFN, Pazvakawambwa L, Leonhardt M, Lien L (2022)
Physical comorbidity among patients attending mental health services at Windhoek Central Hospital, Namibia
Pan Afr Med J, 41, 270
DOI 10.11604/pamj.2022.41.270.27134, PubMed 35734337

Mthoko NFN, Pazvakawambwa L, Leonhardt M, Lien L (2022)
Risk factors for cardiovascular disease among people with mental illness in Namibia
Ghana Med J, 56 (4), 285-294
DOI 10.4314/gmj.v56i4.7, PubMed 37575634

Mæland R, Lien L, Leonhardt M (2022)
Association between cannabis use and physical health problems in Norwegian adolescents: a cross-sectional study from the youth survey Ungdata
BMC Public Health, 22 (1), 661
DOI 10.1186/s12889-022-13136-6, PubMed 35382834

Olstad K, Lien L, Leonhardt M, Sørensen T, Danbolt LJ (2022)
Therapists and the Topic of Meaning in Life in Their Encounters With Adolescents With Developmental Trauma: A Qualitative Study
Front Psychiatry, 13, 835491
DOI 10.3389/fpsyt.2022.835491, PubMed 35250675

Strobel RM, Leistner R, Leonhardt M, Neumann K, Eschlböck SM, Lee LDG, Seifarth C, Schineis CHW, Kamphues C, Weixler B, Beyer K, Lauscher JC (2022)
Is There an Association between Intra-Operative Detection of Pathogens in Subcutaneous Tissue and Surgical Site Infections? Results from a Prospective Study
Surg Infect (Larchmt), 23 (4), 372-379
DOI 10.1089/sur.2021.154, PubMed 35263172

Publications 2021

Abraham R, Leonhardt M, Lien L, Hanssen I, Hauff E, Thapa SB (2021)
The relationship between religiosity/spirituality and quality of life among female Eritrean refugees living in Norwegian asylum centres
Int J Soc Psychiatry, 68 (4), 881-890
DOI 10.1177/00207640211010207, PubMed 33876654

Leonhardt M, Overå S (2021)
Are There Differences in Video Gaming and Use of Social Media among Boys and Girls?-A Mixed Methods Approach
Int J Environ Res Public Health, 18 (11)
DOI 10.3390/ijerph18116085, PubMed 34200039

Strobel RM, Leonhardt M, Förster F, Neumann K, Lobbes LA, Seifarth C, Lee LD, Schineis CHW, Kamphues C, Weixler B, Kreis ME, Lauscher JC (2021)
The impact of surgical site infection-a cost analysis
Langenbecks Arch Surg, 407 (2), 819-828
DOI 10.1007/s00423-021-02346-y, PubMed 34651239

Publications 2020

Drummond C, Hillyard M, Leonhardt M, Wurst F, Dom G, Mann K, Bramness JG (2020)
Comparison of European Clinical Guidelines on the Management of Alcohol Use Disorders
Eur Addict Res, 27 (3), 227-236
DOI 10.1159/000512112, PubMed 33291106

Lauscher JC, Lock JF, Aschenbrenner K, Strobel RM, Leonhardt M, Stroux A, Weixler B, Germer CT, Kreis ME (2020)
Validation of the German Classification of Diverticular Disease (VADIS)-a prospective bicentric observational study
Int J Colorectal Dis, 36 (1), 103-115
DOI 10.1007/s00384-020-03721-9, PubMed 32886196

Strobel RM, Leonhardt M, Krochmann A, Neumann K, Speichinger F, Hartmann L, Lee LD, Beyer K, Daum S, Kreis ME, Lauscher JC (2020)
Reduction of Postoperative Wound Infections by Antiseptica (RECIPE)?: A Randomized Controlled Trial
Ann Surg, 272 (1), 55-64
DOI 10.1097/SLA.0000000000003645, PubMed 31599810

Publications 2019

Leonhardt M, Aschenbrenner K, Gröne J, Kreis ME, Lauscher JC (2019)
Sources of Support and Information During Disease: An Exploratory Study, Comparing Migrant and Nonmigrant Colorectal Cancer Patients in Germany
J Transcult Nurs, 31 (4), 387-396
DOI 10.1177/1043659619875197, PubMed 31516067

Leonhardt M, Aschenbrenner K, Kreis ME, Lauscher JC (2019)
Does migrant background predict to what extent colorectal cancer patients want to be informed about their life expectancy? - a cross-sectional analysis
Int J Equity Health, 18 (1), 192
DOI 10.1186/s12939-019-1105-0, PubMed 31805943

Publications 2018

Leonhardt M, Aschenbrenner K, Kreis ME, Lauscher JC (2018)
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
BMC Health Serv Res, 18 (1), 423
DOI 10.1186/s12913-018-3232-5, PubMed 29879958

Publications 2014

Leonhardt M, Liebers F, Dionne CE, Latza U (2014)
Cross-cultural adaptation of the delphi definitions of low back pain prevalence (German DOLBaPP)
BMC Musculoskelet Disord, 15, 397
DOI 10.1186/1471-2474-15-397, PubMed 25425047