[1] Univ Udine, Dept Otolaryngol Head & Neck Surg, Policlin Univ, I-33100 Udine, Italy
[2] Vrije Univ Amsterdam Med Ctr, Dept Otolaryngol Head & Neck Surg, Amsterdam, Netherlands
[3] Mem Sloan Kettering Canc Ctr, Head & Neck Serv, New York, NY 10021 USA
[4] Oregon Hlth & Sci Univ, Dept Otolaryngol, Portland, OR USA
[5] Hosp Canc AC Camargo, Dept Otorhinolaryngol, Ctr Tratemento & Pesquisa, Sao Paulo, Brazil
[6] Geisinger Med Ctr, Dept Otolaryngol Head & Neck Surg, Danville, PA 17822 USA
[7] Univ Texas, MD Anderson Canc Ctr, Dept Head & Neck Surg, Houston, TX 77030 USA
[8] Aintree Univ Hosp NHS Fdn Trust, Dept Oral & Maxillofacial Surg, Liverpool, Merseyside, England
[9] Liverpool Univ Dent Hosp, Liverpool, Merseyside, England
[10] Univ Oklahoma, Hlth Sci Ctr, Dept Otolaryngol, Oklahoma City, OK USA