1. Department of Otolaryngology—Head and Neck SurgeryUniversity of Toronto Toronto Ontario Canada
2. Institute of Health Policy, Management and Evaluation, University of Toronto Toronto Ontario Canada
3. Division of Otolaryngology—Head and Neck SurgeryDalhousie University Halifax Nova Scotia Canada
4. Department of Otolaryngology—Head and Neck SurgeryRenmin Hospital of Wuhan University Wuhan China
5. Radiation Medicine Program, Princess Margaret Cancer Centre, University Health Network and Department of Radiation OncologyUniversity of Toronto Toronto Ontario Canada