1. Department of Addiction Treatment, Oslo University Hospital, Oslo, Norway;
2. Department of Personality Psychiatry, Oslo University Hospital, Oslo, Norway;
3. NORMENT, Institute of Clinical Medicine, University of Oslo, Oslo, Norway;
4. Department of Acute Psychiatric Ward, Nordland Hospital, Bodoe, Norway;
5. Department of Research and Development, Oslo University Hospital, Oslo, Norway;
6. Institute of Clinical Medicine, University of Oslo, Oslo, Norway