1. Department of Otolaryngology and Division of Cancer Care and Epidemiology; Queen's University; Kingston Ontario Canada
2. Department of Radiation Oncology; University of Toronto; Toronto Ontario Canada
3. Department of Otolaryngology; University of Toronto; Toronto Ontario Canada
4. Juravinski Hospital and Cancer Center; Hamilton Ontario Canada
5. Department of Oncology; Queen's University; Kingston Ontario Canada
6. Department of Public Health Sciences and Division of Cancer Care and Epidemiology; Queen's University; Kingston Ontario Canada