1. Trimbos-instituut and ICASA Foundation; Utrecht The Netherlands
2. Amsterdam Institute for Addiction research, Department of Psychiatry, Academic Medical Centre; University of Amsterdam; Amsterdam The Netherlands
3. Arkin; Amsterdam The Netherlands
4. Reinier van Arkel groep, ’s-Hertogenbosch; The Netherlands
5. Columbia University/The New York State Psychiatric Institute; New York USA
6. Institute of Psychology; Eötvös Loránd University; Budapest Hungary
7. National Drug and Alcohol Research Centre; University of New South Wales; Sydney Australia
8. Bergen Clinics Foundation; Bergen Norway
9. Department of Clinical Neuroscience; Division of Psychiatry, Karolinska Institutet; Stockholm Sweden
10. University Hospital of Psychiatry Berne and Department of Psychology; University of Fribourg; Switzerland
11. Collaborative Antwerp Psychiatry Research Institute (CAPRI, UA); PC Alexian Brothers; Boechout Belgium
12. Laboratoire de psychiatrie Département d'addictologie; Université de Bordeaux; France
13. Østfold Hospital Trust; Department for Substance abuse treatment; Norway
14. University Hospital of Psychiatry; Berne Switzerland
15. Departments of Psychiatry and of Neuroscience and Physiology; SUNY Upstate Medical University; Syracuse NY USA
16. Servei de Psiquiatria, Hospital Universitari Vall d'Hebron, CIBERSAM, Department of Psychiatry; Universitat Autònoma de Barcelona; Barcelona Spain
17. National Drug Research Institute/Curtin University of Technology; Perth Australia
18. Department of Psychiatry; University Medical Centre Groningen, University of Groningen; Groningen The Netherlands