Thomas Babor Professor and Chairman, Department of Community Medicine and Health Care, Health Net, Inc., Endowed Chair in Community Medicine and Public Health, University of Connecticut School of Medicine, Farmington, Connecticut, United States of America Jonathan Caulkins Stever University Professor of Operations Research and Public Policy, Carnegie Mellon University, Heinz College, Pittsburgh, Pennsylvania, United States of America Benedikt Fischer Senior Scientist, Institute for Mental Health Policy Research, Centre for Addiction and Mental Health (CAMH), Toronto, Canada; Professor, Department of Psychiatry, Institute of Medical Science, and Centre for Criminology and Sociolegal Studies, University of Toronto, Toronto, Canada David Foxcroft Professor of Community Psychology and Public Health, Oxford Brookes University, Oxford, United Kingdom Keith Humphreys Research Career Scientist, Department of Veteran Affairs; Professor of Psychiatry, Stanford University, Palo Alto, California, United States of America María Elena Medina-Mora General Director, National Institute on Psychiatry Ramon de la Fuente Muniz, Mexico City, Mexico Isidore Obot Professor of Psychology, University of Uyo; Director, Centre for Research and Information on Substance Abuse (CRISA), Uyo, Akwa Ibom State, Nigeria Jürgen Rehm Senior Scientist and Director, Institute for Mental Health Policy Research, Centre for Addiction and Mental Health (CAMH), Toronto, Canada; Professor and Chair, Addiction Policy, Dalla Lana School of Public Health, University of Toronto, Toronto, Canada Peter Reuter Professor, School of Public Policy and Department of Criminology, University of Maryland, College Park, Maryland, United States of America Robin Room Professor, School of Population Health, University of Melbourne, Melbourne, Australia; Director, AER Centre for Alcohol Policy Research, Turning Point Alcohol and Drug Centre, Fitzroy, Australia; Professor, Centre for Social Research on Alcohol and Drugs, Stockholm University, Stockholm, Sweden Ingeborg Rossow Research Director, Norwegian Institute for Alcohol and Drug Research, Oslo, Norway John Strang Professor of the Addictions and Director, National Addiction Centre, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, United Kingdom