1. 1Department of Cancer Epidemiology and Prevention Research, Cancer Care Alberta, Alberta Health Services, Calgary, Alberta, Canada.
2. 2Department of Kinesiology, Faculty of Health and Human Sciences, University of North Carolina Greensboro, Greensboro, North Carolina.
3. 3Faculty of Kinesiology, Sport, and Recreation, College of Health Sciences, University of Alberta, Edmonton, Alberta, Canada.
4. 4Department of Epidemiology, Colorado School of Public Health, University of Colorado, Aurora, Colorado.
5. 5Department of Community Health Sciences, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.
6. 6Department of Oncology, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.