Affiliation: | (1) Department of Medicine, Princess Margaret Hospital and University of Toronto, 500 Sherbourne Street, M4X 1K9 Toronto, Ontario, Canada;(2) Department of Radiation Oncology, Princess Margaret Hospital, Toronto, Ontario, Canada;(3) Biostatistics Department, Princess Margaret Hospital, Toronto, Ontario, Canada;(4) Montreal Children's Hospital Research Institute, Montreal, Quebec, Canada;(5) Department of Nursing, Princess Margaret Hospital, Toronto, Ontario, Canada |