1. Department of Otolaryngology; Hospital Universitario Central de Asturias; Oviedo Spain
2. Instituto Universitario de Oncología del Principado de Asturias; Oviedo Spain
3. Department of Anatomic Pathology; Hospital Clinic; University of Barcelona; Barcelona Spain
4. Department of Oral Pathology; School of Dentistry; University of Liverpool; Liverpool United Kingdom
5. Department of Pathology; Allegiance Health; Jackson Michigan
6. Department of Radiation Oncology; University of Florida; Gainesville Florida
7. Department of Medicine; Division of Oncology; Albert Einstein College of Medicine; Montefiore Medical Center; Bronx New York
8. Department of Radiation Oncology; Institute of Oncology; Ljubljana Slovenia
9. Department of Otolaryngology-Head and Neck Surgery; Guthrie Health System; Sayre Pennsylvania
10. Department of Otolaryngology-Head and Neck Surgery; University of Michigan; Ann Arbor Michigan
11. Head and Neck Service; Memorial Sloan-Kettering Cancer Center; New York New York
12. Department of Pathology; University of Arkansas for Medical Sciences; Little Rock Arkansas
13. Department of Otolaryngology-Head and Neck Surgery; VU University Medical Center; Amsterdam The Netherlands
14. Department of Otolaryngology-Head and Neck Surgery; Radboud University Medical Center; Nijmegen The Netherlands
15. University of Udine School of Medicine; Udine Italy