1. Department of Medicine, Queen's University, Kingston, Canada
2. Division of Cancer Care and Epidemiology, Queen's University Cancer Research Institute, Kingston, Canada
3. Department of Medicine, University of Calgary, Calgary, Canada
4. Department of Radiology, University of Ottawa, Ottawa, Canada
5. Department of Philosophy, Queen's University, Kingston, Canada
6. Department of Oncology, Queen's University, Kingston, Canada
7. Department of Public Health Sciences, Queen's University, Kingston, Canada
8. Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, CA