Department of Psychology, University of Johannesburg, Johannesburg 2006, South Africa. Section of Infectious Diseases, Department of Medicine, Yale University School of Medicine, New Haven, CT 06510, USA. Yale Institute for Global Health, Yale University, New Haven, CT 06520, USA. Centre for Addiction and Mental Health, Institute for Mental Health Policy Research and Campbell Family Mental Health Research Institute, Toronto, ON M5S 2S1, Canada. Dalla Lana School of Public Health, University of Toronto, Toronto, ON M5T 3M7, Canada. Institute for Collaboration on Health, Intervention, and Policy, University of Connecticut, Storrs, CT 06269, USA. Alcohol, Tobacco and Other Drug Research Unit, South African Medical Research Council, Pretoria 0001, South Africa. Division of Comparative Effectiveness and Decision Science, Department of Population Health, NYU Grossman School of Medicine, New York University, New York, NY 10013, USA. Department of Psychiatry, University of Toronto, Toronto, ON M5T 1R8, Canada. Center for Interdisciplinary Addiction Research (ZIS), Department of Psychiatry and Psychotherapy, University Medical Center Hamburg-Eppendorf (UKE), 20246 Hamburg, Germany. Institute of Clinical Psychology and Psychotherapy, Technische Universität Dresden, 01187 Dresden, Germany. Faculty of Medicine, Institute of Medical Science, University of Toronto, Toronto, ON M5S 1A8, Canada. Program on Substance Abuse, Public Health Agency of Catalonia, 08005 Barcelona, Spain. Department of International Health Projects, Institute for Leadership and Health Management, I.M. Sechenov First Moscow State Medical University (Sechenov University), 119991 Moscow, Russia.