1. Division of Mental Health Services, Akershus University Hospital, Lørenskog, Norway (Skar-Fröding, Clausen, Ruud, Sverdvik Heiervang); Norwegian National Advisory Unit on Concurrent Substance Abuse and Mental Health Disorders and Mental Health Division, Innlandet Hospital Trust, Brumunddal (Clausen); Institute of Clinical Medicine, Campus Ahus, University of Oslo, Oslo (Šaltytė Benth, Ruud); Health Services Research Unit, Akershus University Hospital, Lørenskog, Norway (Šaltytė Benth); Institute of...