van Kernebeek, Michiel W., Vorspan, Florence, Crunelle, Cleo L., van den Brink, Wim, Dom, Geert, Moggi, Franz, Konstenius, Maija, Franck, Johan, Levin, Frances R., van de Glind, Geurt, Ramos-Quiroga, Jose A., Demetrovics, Zsolt, Coetzee, Corné, Luderen, Mathias, Schellekens, Arnt, Matthys, Frieda, Icick, Romain, Institut Català de la Salut, [van Kernebeek MW, Crunelle CL ] Department of Psychiatry, Vrije Universiteit Brussel (VUB), Universitair Ziekenhuis Brussel (UZ Brussel), Brussels, Belgique. [Vorspan F] Département de psychiatrie et de médecine addictologique, Assistance Publique–Hôpitaux de Paris (AP–HP), Groupe Hospitalier Saint-Louis, Lariboisière-Fernand Widal, Paris, France. Inserm U1144, optimization thérapeutique en neuropsychopharmacologie, Paris, France. Université de Paris, Inserm UMR-S1144, Paris, France. [van den Brink W] Amsterdam Institute of Addiction Research (AIAR), Academic Medical Center, University of Amsterdam, Amsterdam, Pays-Bas. [Dom G] Antwerp University & Hospital, Addiction Psychiatry, Psychiatric Center Alexian Brothers, Antwerp, Belgique. [Moggi F] University Hospital of Psychiatry, University of Bern, Bern, Suisse. [van de Glindj G] Bachelor School of Nursing, Institute for Nursing Studies, University of Applied Science, Utrecht, Pays-Bas. Servei de Psiquiatria, Vall d’Hebron Hospital Universitari, Barcelona, Spain. [Ramos-Quiroga JA] Unitat de Genètica Psiquiàtrica, Vall d’Hebron Institut de Recerca (VHIR), Barcelona, Spain. Biomedical Network Research Centre on Mental Health (CIBERSAM), Barcelona, Espagne. Departament de Psiquiatria i Medicina Legal, Universitat Autònoma de Barcelona, Bellaterra, Spain, Vall d'Hebron Barcelona Hospital Campus, and ICASA Consensus Group