1. Division of General Surgery, Ottawa Hospital, Ottawa, Ontario, Canada2Ottawa Hospital Research Institute, University of Ottawa, Ottawa, Ontario, Canada
2. Ottawa Hospital Research Institute, University of Ottawa, Ottawa, Ontario, Canada
3. Division of Cancer Care and Epidemiology, Queens University Cancer Research Institute, Kingston, Ontario, Canada4Department of Oncology, Queens University, Kingston, Ontario, Canada
4. Ottawa Hospital Research Institute, University of Ottawa, Ottawa, Ontario, Canada5Department of Radiology, University of Ottawa, Ottawa, Ontario, Canada
5. Ottawa Hospital Research Institute, University of Ottawa, Ottawa, Ontario, Canada6School of Epidemiology, Public Health and Preventive Medicine, University of Ottawa, Ottawa, Ontario, Canada
6. Department of Oncology, Queens University, Kingston, Ontario, Canada
7. Department of Medical Oncology, Ottawa Hospital Cancer Center, Ottawa, Ontario, Canada
8. Ottawa Hospital Research Institute, University of Ottawa, Ottawa, Ontario, Canada7Department of Medical Oncology, Ottawa Hospital Cancer Center, Ottawa, Ontario, Canada