1Addiction Research Institute, Zürich, Switzerland
2Centre for Addiction and Mental Health, Toronto, Ont., Canada
3University of Toronto, Toronto, Ont., Canada
4Management of Substance Dependence, World Health Organization, Geneva, Switzerland
5Centre for Social Research on Alcohol and Drugs, Stockholm University, Stockholm, Sweden
6Swiss Institute for the Prevention of Alcohol and Other Drug Problems, Lausanne, Switzerland
7Health Policy Institute, Georgetown University, Washington, D.C., USA, and
8Working Group Public Mental Health, Psychiatric University Hospital Zürich, Zürich, Switzerland