1. Competence Centre of Dual Diagnosis, Mental Health Services of the Capital Region, Mental Health Centre Sct. Hans, Roskilde, Denmark
2. Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
3. Mental Health Services of the Capital Region, Mental Health Centre Sct. Hans, Roskilde, Denmark
4. Mental Health Services of the Capital Region, Mental Health Centre Amager, Copenhagen, Denmark
5. Psychiatric Research Unit, Region Zealand Psychiatry, Region Zealand, Denmark
6. National Institute of Public Health, University of Southern, Odense, Denmark