1. Department of Research and Development in Mental Health Akershus University Hospital Loerenskog Norway
2. University of Oslo, Norwegian Centre for Addiction Research Oslo Norway
3. Vestfold Hospital Trust Toensberg Norway
4. Department of Addiction Medicine Haukeland University Hospital Bergen Norway
5. University of Bergen Bergen Norway
6. Groruddalen Outpatient Department Akershus University Hospital Oslo Norway
7. Department of Addiction Medicine Oslo University Hospital Oslo Norway
8. Institute of Clinical Medicine, Campus Ahus University of Oslo Blindern Norway
9. Akershus University Hospital, Health Services Research Unit Loerenskog Norway
10. Lovisenberg Diaconal Hospital Oslo Norway
11. Oslo Metropolitan University, Faculty for Health Science Oslo Norway