1. Department of Medicine, University of Toronto , Toronto, ON, Canada
2. Sunnybrook Odette Cancer Centre , Toronto, ON, Canada
3. Institute for Clinical Evaluative Sciences , Toronto, ON, Canada
4. Canadian Centre for Applied Research in Cancer Control , Vancouver, BC, Canada
5. Institute of Health Policy, Management and Evaluation, University of Toronto , Toronto, ON, Canada
6. Dana-Farber Cancer Institute , Boston, MA, USA
7. Centre for Addition and Mental Health , Toronto, ON, Canada
8. Department of Psychiatry, University of Toronto , Toronto, ON, Canada
9. University of Washington Fred Hutchinson Cancer Center , Seattle, WA, USA
10. Princess Margaret Cancer Centre , Toronto, ON, Canada