1. Interdisciplinary Social Science, Youth Studies, Utrecht University, Utrecht, The Netherlands
2. Faculty of Law and Criminology, Institute for Social Drug Research, Ghent University, Ghent, Belgium
3. Sociology Social Policy and Social Work, Queens University Belfast, Belfast, UK
4. Departamento de Medicina Preventiva, Universidade Federal de São Paulo, Sao Paulo, Brazil
5. European Monitoring Centre for Drugs and Drug Addiction (EMCDDA), Lisbon, Portugal