1. Finnish Institute for Health and Welfare, Helsinki, Finland
2. Karolinska Institutet, Stockholm, Sweden
3. Norwegian Institute of Public Health, Oslo, Norway
4. National Institute of Public Health, University of Southern Denmark, Copenhagen, Denmark
5. Center for Clinical Research and Prevention, Bispebjerg and Frederiksberg Hospital, The Capital Region, Denmark
6. Swedish council for information on alcohol and other drugs, Stockholm, Sweden
7. University of Helsinki, Helsinki, Finland
8. Centre for Alcohol and Drug Research, Aarhus University, Denmark