1. Department of Otolaryngology-Head & Neck Surgery; Christiana Care/Thomas Jefferson University; Newark Delaware U.S.A
2. Department of Otolaryngology-Head & Neck Surgery; Johns Hopkins University School of Medicine; Baltimore Maryland U.S.A
3. Department of Surgery; University of Auckland
4. Department of Otolaryngology-Head & Neck Surgery; Counties-Manukau Health, University of Auckland; Auckland New Zealand
5. Department of Otorhinolaryngology-Head and Neck Surgery; University of Brescia; Brescia Italy
6. Department of Otorhinolaryngology-Head and Neck Surgery
7. Department of Oncology; Section Head & Neck Oncology, University Hospitals Leuven; Leuven Belgium
8. Department of Otorhinolaryngology-Head and Neck Surgery; University Hospital Bern; Bern Switzerland