1. Division of Otolaryngology—Head and Neck Surgery, McMaster University, Hamilton, Canada.
2. Division of Otolaryngology—Head and Neck Surgery, Hôpital Maisonneuve-Rosemont, University of Montreal, Montreal, Canada.
3. Department of Otolaryngology—Head and Neck Surgery and Western University, London, Canada.
4. Department of Head and Neck Surgery, Hospital Aleman of Buenos Aires, Buenos Aires, Argentina.
5. Department of Otolaryngology—Head and Neck Surgery, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Canada.
6. Department of Surgery, Toronto General Hospital, University of Toronto, Toronto, Canada.
7. Division of Endocrinology, Western University, London, Canada.
8. Division of Endocrinology, Department of Medicine, Université Laval, Quebec City, Canada.
9. Department of Otolaryngology, Head and Neck Surgery, McGill University Health Centre, Montreal, Canada.
10. Department of Otolaryngology Head and Neck Surgery, Jewish General Hospital, McGill University, Montreal, Canada.
11. Department of Otolaryngology, University of Zurich, Zurich, Switzerland.
12. Department of Otolaryngology—Head and Neck Surgery, Centre Hospitalier de l'Universite Sherbrooke, Sherbrooke, Canada.
13. Divisions of Endocrinology and University of Calgary, Calgary, Canada.
14. Divisions of Otolaryngology, University of Calgary, Calgary, Canada.
15. Division of Otolaryngology, University of British Columbia, Vancouver, Canada.
16. Division of Otolaryngology—Head and Neck Surgery, Centre Hospitalier de l'Université de Montréal, Université de Montréal, Montreal, Canada.
17. Department of Otolaryngology, Mount Sinai Hospital, University of Toronto, Toronto, Canada.
18. Department of Radiation Oncology and Dalhousie University, Halifax, Canada.
19. Division of Otolaryngology, Dalhousie University, Halifax, Canada.
20. Faculty of Medicine, Saint Mary's University, Halifax, Canada.
21. Department of Head and Neck Surgery, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA.