[1] Montefiore Med Ctr, Albert Einstein Coll Med, Dept Med, Div Oncol, Bronx, NY 10467 USA
[2] Univ Chicago, Dept Med, Chicago, IL 60637 USA
[3] Univ Chicago, Ctr Comprehens Canc, Chicago, IL 60637 USA
[4] Univ Michigan, Dept Otolaryngol Head & Neck Surg, Ann Arbor, MI 48109 USA
[5] Inst Oncol, Dept Radiat Oncol, Ljubljana, Slovenia
[6] Univ Michigan, Dept Radiat Oncol, Ann Arbor, MI 48109 USA
[7] Univ Udine, ENT Clin, I-33100 Udine, Italy