1. Cancer Education Program, Princess Margaret Cancer Centre, Toronto, Ontario, Canada
2. Patient Education, Cancer Care Ontario, Toronto, ON
3. Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
4. Department of Radiation Oncology, Princess Margaret Cancer Centre, Toronto, Ontario, Canada
5. Department of Radiation Oncology, University of Toronto, Toronto, ON
6. Division of Radiation Oncology, MD Anderson Cancer Centre, Houston, Texas