1. Department of Surgical Oncology; Medical School of Crete University Hospital; Heraklion Greece
2. Department of Pathology; University of Arkansas for Medical Sciences; Little Rock Arkansas
3. Department of Otolaryngology-Head and Neck Surgery; Radboud University Nijmegen Medical Center; Nijmegen The Netherlands
4. Department of Otolaryngology; Hospital Universitario Central de Asturias; Oviedo Spain
5. Instituto Universitario de Oncología del Principado de Asturias; Oviedo Spain
6. Department of Radiation Oncology; University of Florida; Gainesville Florida
7. Department of Otolaryngology-Head and Neck Surgery; Mayo Clinic; Phoenix Arizona
8. Head and Neck Service; Memorial Sloan-Kettering Cancer Center; New York New York
9. ENT Clinic; University of Udine; Udine Italy
10. Department of Otolaryngology-Head and Neck Surgery; VU University Medical Center; Amsterdam The Netherlands