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