[1] Emory Univ, Dept Radiat Oncol, Winship Canc Inst, 550 Peachtree St NE, Atlanta, GA 30308 USA
[2] Emory Univ, Dept Otolaryngol, Winship Canc Inst, Atlanta, GA 30322 USA
[3] Emory Univ, Dept Med Hematol Oncol, Winship Canc Inst, Atlanta, GA 30322 USA
[4] Fox Chase Canc Ctr, Dept Surg Oncol, 7701 Burholme Ave, Philadelphia, PA 19111 USA
[5] Antwerp Univ Hosp, Dept Med Oncol, Edegem, Belgium
[6] Univ Antwerp, Fac Med & Hlth Sci, Antwerp, Belgium
[7] Univ Michigan Hlth Syst, Dept Otolaryngol Head & Neck Surg, Ann Arbor, MI USA
[8] Inst Oncol, Dept Radiat Oncol, Ljubljana, Slovenia
[9] Inst Salud Carlos III, Inst Invest Sanitaria Principado Asturias, Oviedo, Spain
[10] Inst Salud Carlos III, Ctr Invest Biomed Red Canc, Oviedo, Spain
[11] Univ Oviedo, Inst Univ Oncol Principado Asturias, Oviedo, Spain
[12] Univ Oviedo, Dept Otolaryngol, Hosp Univ Cent Asturias, Inst Oncol Asturias,Ctr Invest Biomed Red Canc, Oviedo, Spain
[13] Univ Udine, Sch Med, Udine, Italy
[14] Int Head & Neck Sci Grp, Padua, Italy