1. Department of Surgical Oncology; Princess Margaret Hospital; Department of Otolaryngology - Head and Neck Surgery; University of Toronto; Toronto Ontario Canada
2. Department of Radiation Oncology; Princess Margaret Hospital; University of Toronto; Toronto Ontario Canada
3. Department of Otolaryngology - Head and Neck Surgery; University of Michigan; Ann Arbor Michigan
4. Division of Health Care and Outcomes Research; Toronto Western Research Institute; University Health Network; University of Toronto; Toronto Ontario Canada