1. Department of Oncology, Cumming School of Medicine, University of Calgary, Calgary, AB T2N 4N1, Canada
2. Department of Community Health Sciences, Cumming School of Medicine, University of Calgary, Calgary, AB T2N 4N1, Canada
3. Department of Cancer Epidemiology and Prevention Research, Cancer Care Alberta, Calgary, AB T2N 4N1, Canada
4. Department of Medicine, Cumming School of Medicine, University of Calgary, Calgary, AB T2N 4N1, Canada
5. Forzani & MacPhail Colon Cancer Screening Centre, Alberta Health Services, Calgary, AB T2N 4Z6, Canada