1. Grup Recerca Addiccions Clínic (GRAC-GRE), Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Hospital Clínic Barcelona, Barcelona, Spain
2. Department of Internal Medicine, Hospital Universitari Germans Trias i Pujol, Badalona, Spain
3. Department of Psychiatry, Amsterdam University Medical Centres, Location AMC, University of Amsterdam, Amsterdam, Netherlands
4. Central Institute of Mental Health, University of Heidelberg, Mannheim, Germany