1. Department of Otorhinolaryngology and Head and Neck Surgery, Radboud University Medical Center, 6225 GA Nijmegen, The Netherlands
2. Department of Oncologic Surgery, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands
3. Unit of Otorhinolaryngology—Head and Neck Surgery, Department of Medical and Surgical Specialties, Radiological Sciences, and Public Health, University of Brescia, 25123 Brescia, Italy
4. Department of Head and Neck Surgical Oncology, University Medical Center Utrecht, 3584 CX Utrecht, The Netherlands
5. Department of Otorhinolaryngology, Jena University Hospital, 07747 Jena, Germany
6. Department of Head and Neck Surgery, University of Sao Paulo Medical School, Sao Paulo 01509, Brazil
7. Department of Head and Neck Surgery and Otorhinolaryngology, AC Camargo Cancer Center, Sao Paulo 01509, Brazil
8. Department of Otorhinolaryngology-Head and Neck Surgery, University Hospitals Leuven, 3000 Leuven, Belgium
9. Department of Oncology, Section Head and Neck Oncology, KU Leuven, 3000 Leuven, Belgium
10. Department of Otolaryngology, Hospital Universitario Central de Asturias, University of Oviedo, ISPA, IUOPA, CIBERONC, 33011 Oviedo, Spain
11. Institute of Pathology, Faculty of Medicine, University of Ljubljana, 1000 Ljubljana, Slovenia
12. Department of Otolaryngology-Head and Neck Surgery, Louisiana State University-Health Shreveport, Shreveport, LA 71101, USA
13. Department of Otolaryngology-Head and Neck Surgery, National University of Singapore, Level 7 Tower Block, National University Hospital, 1E Kent Ridge Road, Singapore 119228, Singapore
14. Department of Otolaryngology and Maxillofacial Surgery, University of Zielona Gora, 65-417 Zielona Gora, Poland
15. Head and Neck Service, Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
16. Coordinator of the International Head and Neck Scientific Group, 35122 Padua, Italy