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, Norway University of Applied Sciences, Norway
3. Norwegian Institute of Public Health, Oslo, Norway
4. Drammen Municipal Mental Health and Drug Addiction Services, Drammen, Norway
5. University of South-Eastern Norway, Norway