1. a Centre for Clinical Epidemiology & Evaluation , Vancouver Coastal Health Research Institute
2. b Department of Family Practice , University of British Columbia , Vancouver, British Columbia, Canada
3. c Women's College Research Institute, Women's College Hospital & Dalla Lana School of Public Health , University of Toronto , Toronto, Ontario, Canada
4. d Department of Sociology , Trent University , Peterborough, Ontario, Canada
5. e Juravinski Cancer Centre , Hamilton, Ontario, Canada