1. National Advisory Unit on Concurrent Substance Abuse and Mental Health Disorders, Innlandet Hospital Trust, Department of Mental Health Brumunddal Norway
2. Norwegian Centre for Addiction Research (SERAF) Institute of Clinical Medicine, University of Oslo Oslo Norway
3. National Advisory Unit on Substance Use Disorder Treatment Oslo University Hospital Oslo Norway
4. Department of Forensic Sciences Oslo University Hospital Oslo Norway
5. Institute of Clinical Medicine, University of Oslo Oslo Norway
6. Department of Clinical Pharmacology St Olav's Hospital Trondheim University Hospital Trondheim Norway