1. Department of Oncology, McMaster University, Hamilton, Ontario, Canada.
2. Institute for Clinical Evaluative Sciences, Toronto, Ontario, Canada.
3. Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada.
4. School of Population and Public Health, University of British Columbia, Vancouver, British Columbia, Canada.
5. Department of Oncology, University of Alberta, Edmonton, Alberta, Canada.
6. Canadian Centre for Applied Research in Cancer Control, Vancouver, British Columbia, Canada.
7. British Columbia Cancer Research Centre, Vancouver, British Columbia, Canada.
8. Department of Family Medicine, Dalhousie University, Halifax, Nova Scotia, Canada.
9. Department of Radiation Oncology, University of Toronto, Toronto, Ontario, Canada.