1. Department of Medicine University of Calgary Calgary Canada
2. Division of Cancer Care and Epidemiology Queen's University Cancer Research Institute Kingston Canada
3. Department of Medicine Queen's University Kingston Canada
4. Department of Oncology Queen's University Kingston Canada
5. Department of Public Health Sciences Queen's University Kingston Canada
6. Department of Epidemiology and Biostatistics University of California San Francisco San Francisco California
7. Institute of Cancer Policy, School of Cancer Sciences Kings College London London United Kingdom