1. Department of Otolaryngology-Head and Neck Surgery/Surgical Oncology; Wharton Head and Neck Program, University Health Network, Princess Margaret Hospital, University of Toronto; Toronto; Ontario; Canada
2. Department of Radiation Oncology; Princess Margaret Hospital, University of Toronto; Toronto; Ontario; Canada
3. Department of Pathology; University Health Network, University of Toronto; Toronto; Ontario; Canada
4. Department of Biostatistics; Princess Margaret Hospital, University of Toronto; Toronto; Ontario; Canada