[1] Harvard Med Sch, Boston, MA USA
[2] Beth Israel Deaconess Med Ctr, Div Otolaryngol Head & Neck Surg, Boston, MA 02215 USA
[3] Harvard Med Sch, Dept Otolaryngol, Boston, MA USA
[4] Massachusetts Eye & Ear, Dept Otolaryngol Head & Neck Surg, Boston, MA USA