Published on in Vol 18 , No 5 (2016) :May

1 German Centre for Addiction Research in Childhood and Adolescence (DZSKJ), Centre for Psychosocial Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, DE
2 Centre for Psychiatry Research, Department of Clinical Neuroscience, Karolinska Institutet & Stockholm Health Care Services, Stockholm, SE
3 VAD, Vereniging voor Alcohol- en andere Drugproblemen, Brussels, BE
4 Clinical Health Promotion Centre, Faculty of Medicine, Lund University & Skåne University Hospital, Malmö, SE
5 WHO Collaborating Centre, Bispebjerg & Frederiksberg Hospital Faculty of Medicine, University of Southern Denmark, Copenhagen, DK
6 Centre for Epidemiological and Clinical Research on Addictions, National Institute of Mental Health (NIMH), Klecany, CZ
*these authors contributed equally