1. Department of Research and DevelopmentClinic of Substance Use and Addiction Medicine, St. Olavs University HospitalTrondheim Norway
2. Department of PsychologyUniversity of OsloOslo Norway
3. Norwegian National Advisory Unit on Concurrent Substance Abuse and Mental Health DisordersInnlandet Hospital TrustBrumunddal Norway
4. Norwegian Centre for Addiction ResearchUniversity of OsloOslo Norway
5. Innlandet University of Applied Sciences, Campus ElverumElverum Norway
6. Norwegian National Advisory Unit on Concurrent Substance Abuse and Mental Health DisordersMental Health Division, Innlandet Hospital TrustBrumunddal Norway