1. Department of Psychiatry, University of Helsinki, Helsinki, Finland
2. Psychiatry, Hyvinkää Area, Hospital District of Helsinki and Uusimaa, Finland
3. Department of Psychiatry, University of Turku, Turku, Finland
4. Centre for Life Course Research, University of Oulu, Oulu, Finland
5. Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Oulu, Finland
6. Department of Psychiatry, Seinäjoki Central Hospital, Finland
7. Norwegian Institute of Public Health, Oslo, Norway
8. The Arctic University of Norway, Tromsø, Norway
9. Norwegian National Advisory Unit on Concurrent Substance Abuse and Mental Health Disorders, Innlandet Hospital Trust, Hamar, Norway
10. Addiction Psychiatry Unit, Department of Psychiatry, Turku University Hospital, Turku, Finland