[1] Leiden Univ, Med Ctr, Dept Otorhinolaryngol Head & Neck Surg, Leiden, Netherlands
[2] Massachusetts Gen Hosp, Dept Radiat Oncol, Boston, MA 02114 USA
[3] Univ Arizona, Coll Med, Dept Otolaryngol Head & Neck Surg, Tucson, AZ USA
[4] Massachusetts Gen Hosp, Dept Neurosurg, Boston, MA 02114 USA
[5] HollandPTC, Delft, Zuid Holla, Netherlands
[6] Leiden Univ, Med Ctr, Dept Radiat Oncol, Leiden, Netherlands
[7] Massachusetts Eye & Ear Infirm, Dept Otorhinolaryngol Head & Neck Surg, Boston, MA 02114 USA