1. Department of Clinical Medicine University of Tromsø ‐ The Arctic University of Norway Tromsø Norway
2. Division of Mental Health and Substance Abuse University Hospital of North Norway Tromsø Norway
3. Department of Community Medicine University of Tromsø ‐ The Arctic University of Norway Tromsø Norway
4. Norwegian Institute of Public Health Oslo Norway
5. National Advisory Unit on Concurrent Substance Abuse and Mental Health Disorders, Innlandet Hospital Trust Hamar Norway