1. Division of Radiation Oncology, University of Ottawa; Radiation Medicine Program & Ottawa Hospital Research Institute, The Ottawa Hospital, 501 Smyth Road, Ottawa, Ontario, K1H8L6, Canada
2. Radiation Medicine Program, The Ottawa Hospital, Ottawa, Ontario, Canada
3. Departments of Radiation Oncology & Psychosocial Oncology & Palliative Care, Dana-Farber Cancer Institute, Boston, MA, USA
4. Harvard Medical School, MA, USA
5. Department of Radiation Oncology, Sunnybrook Health Sciences Center, University of Toronto, Toronto, Ontario, Canada