1. Department of Surgery, Faculty of Medicine, University of Colombo , Colombo , Sri Lanka
2. National Cancer Institute , Maharagama , Sri Lanka
3. Department of Oncology, Queen’s University , Kingston, Ontario , Canada
4. Division of Cancer Care and Epidemiology, Queen’s University Cancer Research Institute , Kingston, Ontario , Canada
5. Department of Public Health Sciences, Queen’s University , Kingston, Ontario , Canada
6. Department of Medicine, Queen’s University , Kingston, Ontario , Canada