1. Norwegian National Advisory Unit on Concurrent Substance Abuse and Mental Health Disorders (NK-ROP), Innlandet Hospital Trust and University of South-Eastern Norway, Norway
2. Norwegian National Advisory Unit on Concurrent Substance Abuse and Mental Health Disorders (NK-ROP) Innlandet Hospital Trust; and Faculty of Health and Social Sciences, Inland Norway University of Applied Sciences, Norway
3. Norwegian Institute of Public Health, Norway
4. University of South-Eastern Norway, Kongsberg, Norway