1. Department of Research and Development, Clinic of Substance Use and Addiction Medicine, St. Olavs University Hospital, Trondheim, Norway
2. Department of Sociology and Political Science, Norwegian University of Science and Technology, Trondheim, Norway
3. Norwegian National Advisory Unit on Concurrent Substance Abuse and Mental Health Disorders, Mental Health Division, Innlandet Hospital Trust, Brumunddal, Norway
4. Department of Psychology, University of Oslo, Oslo, Norway
5. Norwegian National Advisory Unit on Concurrent Substance Abuse and Mental Health Disorders, Innlandet Hospital Trust, Brumunddal, Norway
6. Norwegian Centre for Addiction Research, University of Oslo, Oslo, Norway
7. Innlandet University of Applied Sciences, Faculty of Social and Health Sciences, Section for Mental Health and Rehabilitation, Campus Elverum, Norway