[1] Massachusetts Eye & Ear Infirm, Dept Otolaryngol, Boston, MA 02114 USA
[2] Massachusetts Gen Hosp, Dept Radiat Oncol, Boston, MA 02114 USA
[3] Beth Israel Deaconess Med Ctr, Div Otolaryngol Head & Neck Surg, Boston, MA 02215 USA
[4] Harvard Univ, Sch Med, Dept Otol & Laryngol, Boston, MA 02115 USA