1. Department of Otolaryngology-Head and Neck Surgery; University of Toronto; Toronto Ontario
2. Division of Otolaryngology- Head and Neck Surgery, Department of Surgery; Dalhousie Medicine New Brunswick; St. John New Brunswick
3. Dalla Lana School of Public Health; University of Toronto; Ontario
4. Department of Biostatistics; Princess Margaret Hospital; Toronto Ontario
5. Department of Radiation Oncology; Princess Margaret Cancer Centre-University Health Network, University of Toronto; Toronto Ontario Canada