1. Department of Radiation Oncology, Odette Cancer Centre, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada
2. Department of Radiation Oncology, Temerty Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
3. Department of Radiation Oncology, University of British Columbia, BC Cancer Victoria, Victoria, British Columbia, Canada
4. Radiation Medicine Program, Stronach Regional Cancer Centre, Southlake Regional Health Centre, Newmarket, Ontario, Canada
5. Department of Radiation Oncology, Durham Regional Cancer Centre, Oshawa, Ontario, Canada
6. Radiation Oncology, Simcoe Muskoka Regional Cancer Program, Royal Victoria Regional Health Centre, Barrie, Ontario, Canada
7. Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, Ontario, Canada
8. Department of Physics and Atmospheric Science, Faculty of Medicine, Dalhousie University, Halifax, Nova Scotia, Canada