1. Department of Research and Development, Clinic of Substance Use and Addiction Medicine, St. Olavs University Hospital, Trondheim, Norway
2. Department of Analysis and Performance Assessment, The Norwegian Directorate of Health, Trondheim, Norway
3. Mental Health Services, Akerhus University Hospital, Lørenskog, Norway
4. Institute of Clinical Medicine, University of Oslo, Oslo, Norway
5. Department of Health, SINTEF Technology and Society, Trondheim, Norway