1. National Addiction Centre, Institute of Psychiatry, Psychology and Neuroscience, Kings College London, London, United Kingdom
2. Institute for Mental Health Policy Research, Centre for Addiction and Mental Health, Toronto, Ontario, Canada
3. Department of Psychiatry, University of Toronto, Toronto, Ontario, Canada
4. Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada
5. School of Public Health Sciences, University of Waterloo, Waterloo, Ontario, Canada
6. Humber River Health Research Institute, Humber River Hospital, Toronto, Ontario, Canada