1. Division of Otolaryngology-Head and Neck Surgery; Department of Surgery McMaster University; Hamilton Canada
2. Department of Otolaryngology-Head and Neck Surgery; Western University; London Canada
3. Department of Otolaryngology-Head and Neck Surgery; University of Toronto; Toronto Canada
4. Division of Otolaryngology-Head and Neck Surgery; University of British Columbia; Vancouver Canada
5. Department of Otolaryngology-Head and Neck Surgery; Cambridge Memorial Hospital; Cambridge Canada