1. Lineberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill , Chapel Hill, NC, USA
2. Department of Otolaryngology/Head and Neck Surgery, University of North Carolina at Chapel Hill , Chapel Hill, NC, USA
3. Division of Oral and Craniofacial Health Sciences, Adams School of Dentistry, University of North Carolina at Chapel Hill , Chapel Hill, NC, USA
4. Division of Hematology/Oncology, Department of Medicine, The University of North Carolina at Chapel Hill , Chapel Hill, NC, USA
5. Department of Pathology and Laboratory Medicine, School of Medicine, University of North Carolina at Chapel Hill , Chapel Hill, NC, USA
6. Department of Surgery, University of North Carolina at Chapel Hill , Chapel Hill, NC, USA
7. Division of Public Health, Department of Family and Preventive Medicine and Huntsman Cancer Institute, University of Utah School of Medicine , Salt Lake City, UT, USA
8. Section of Hygiene, University Department of Life Sciences and Public Health, Università Cattolica del Sacro Cuore , Rome, Italy
9. Regional Authority of Public Health , Banska Bystrica, Slovakia
10. Department of Cancer Epidemiology and Prevention, M. Sklodowska-Curie National Research Institute of Oncology , Warsaw, Poland
11. Department of Environmental Epidemiology, Nofer Institute of Occupational Medicine , Lodz, Poland
12. Institute of Oncology Angel H. Roffo, University of Buenos Aires , Buenos Aires, Argentina
13. Epidemiology Department, School of Public Health, University of São Paulo , São Paulo, Brazil
14. Oncocentro Foundation of São Paulo , São Paulo, Brazil
15. Department of Head and Neck, Heliopolis Hospital , São Paulo, Brazil
16. Cancer Institute of the State of São Paulo (ICESP) , São Paulo, Brazil
17. Institute of Hygiene and Epidemiology, Charles University in Prague , Prague, Czech Republic
18. Unit of Cancer Epidemiology, Centro di Riferimento Oncologico di Aviano (CRO) IRCCS , Aviano, Italy
19. University of Padua , Padova, Italy
20. Department of Medical Sciences, University of Turin , Turin, Italy
21. Department of Otolaryngology/Head and Neck Surgery, University of Pittsburgh , PA, USA
22. Bristol Dental School, University of Bristol , Bristol, UK
23. Stony Brook Cancer Center, Department of Family, Population and Preventive Medicine, Stony Brook University , Stony Brook, NY, USA
24. Department of Medical and Surgical Sciences, University of Bologna Italy
25. Department of Epidemiology, Gillings School of Global Public Health, The University of North Carolina at Chapel Hill , Chapel Hill, NC, USA
26. Division of Pediatric and Public Health, Adams School of Dentistry, University of North Carolina at Chapel Hill , Chapel Hill, NC, USA
27. Department of Tumor Biology, H. Lee Moffitt Cancer Center & Research Institute , Tampa, FL, USA
28. Department of Head and Neck-Endocrine Oncology, H. Lee Moffitt Cancer Center & Research Institute , Tampa, FL, USA