[1] LSU Hlth Sci Ctr, Dept Otolaryngol Head & Neck Surg, Shreveport, LA 70112 USA
[2] Overton Brooks VA Med Ctr, Surg Serv, Otolaryngol Sect, Shreveport, LA USA
[3] Genesiscare St Vincents Hosp, Dept Radiat Oncol, Melbourne, Vic, Australia
[4] Inst Oncol, Dept Radiat Oncol, Ljubljana, Slovenia
[5] Univ Hosp Leuven, Otorhinolaryngol Head & Neck Surg, Leuven, Belgium
[6] Katholieke Univ Leuven, Dept Oncol, Sect Head & Neck Oncol, Leuven, Belgium
[7] Univ Helsinki, Helsinki Univ Hosp, Dept Otorhinolaryngol Head & Neck Surg, Helsinki, Finland
[8] Univ Michigan, Dept Radiat Oncol, Ann Arbor, MI USA
[9] Southern Illinois Univ, Sch Med, Dept Otolaryngol Head & Neck Surg, Springfield, IL USA
[10] Prince Wales Canc Ctr, Dept Radiat Oncol, Sydney, NSW, Australia
[11] UCLA, Dept Otolaryngol Head & Neck Surg, Los Angeles, CA USA
[12] Deusto Univ, Donostia Univ Hosp, Biodonostia Res Inst, Otorhinolaryngol Head & Neck Dept, Bilbao, Spain
[13] Univ Oxford, Nuffield Dept Surg Sci, Oxford, England
[14] Camden FD, Camden, ME USA
[15] Int Head & Neck Sci Grp, Padua, Italy