1. Division of Cancer Epidemiology and Genetics, National Cancer Institute, Rockville, MD, USA
2. Department of Cancer Epidemiology and Prevention Research, Cancer Care Alberta, Alberta Health Services, Edmonton, AB, Canada
3. Departments of Oncology and Community Health Sciences, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
4. Faculty of Kinesiology, Sport, and Recreation, University of Alberta, Edmonton, AB, Canada
5. School of Population and Public Health, The University of British Columbia, Vancouver, BC, Canada
6. Cancer Control Research, BC Cancer, Vancouver, BC, Canada