1. Department of Radiation Oncology and
2. Division of Clinical Sciences and Biostatistics, Princess Margaret Hospital, University of Toronto, Toronto, ON;
3. Institute for Clinical Evaluative Sciences, Toronto, ON;
4. Department of Medical Oncology, Princess Margaret Hospital, University of Toronto, Toronto, ON;
5. National Cancer Institute of Canada Clinical Trials Group and the Cancer Research Institute, Queen's University, Kingston, ON;
6. Division of Radiation Oncology, Juravinski Cancer Centre, McMaster University, Hamilton, ON;
7. Division of Cardiology, Toronto Western Hospital, University of Toronto, Toronto, ON; and
8. Department of Health Policy, Management and Evaluation, University of Toronto, Toronto, ON