1. Department of Studies on Alcoholism and Drug Dependence, Institute of Psychiatry and Neurology, Warsaw, Poland
2. Centre for Alcohol and Drug Research, Aarhus University, Aarhus, Denmark
3. Eclectica, Torino, Italy
4. Drug and Alcohol Research Centre, Middlesex University, London, UK
5. European Centre for Social Welfare Policy and Research, Vienna, Austria
6. Heidelberg Institute of Global Health (HIGH), University of Heidelberg, Heidelberg, Germany
7. Department of Health and Social Work, Institute of Addiction Research (ISFF), Frankfurt University of Applied Sciences, Frankfurt, Germany
8. Department of Public Health, Institute of Psychiatry and Neurology, Warsaw, Poland