1. Department of Clinical Science University of Bergen Norway
2. Division of Mental Health Norwegian Institute of Public Health Bergen Norway
3. Alcohol and Drug Research Western Norway Stavanger University Hospital Stavanger Norway
4. Uni Health Uni Research Bergen Norway
5. Department of Psychiatry Helse Fonna HF Haugesund Norway
6. Division of Epidemiology Norwegian Institute of Public Health Oslo Norway
7. Department of Pain Management and Research Oslo University Hospital and Faculty of Medicine University of Oslo Norway
8. Division of Mental Health Norwegian Institute of Public Health Oslo Norway