[1] Washington Univ, Dept Radiat Oncol, Sch Med, St Louis, MO USA
[2] St Louis Univ, Sch Med, St Louis, MO USA
[3] Washington Univ, Sch Med, Dept Otolaryngol, St Louis, MO 63110 USA
[4] Florida Hosp, Kissimmee, FL USA
[5] Amer Board Otolaryngol, Houston, TX USA
[6] Washington Univ, Dept Med Oncol, St Louis, MO USA