[1] UPMC Hillman Canc Ctr, Dept Radiat Oncol, Pittsburgh, PA USA
[2] Univ Pittsburgh, Med Ctr, Pittsburgh, PA USA
[3] Univ Pittsburgh, Med Ctr, Div Head & Neck Surg, Dept Otolaryngol, Pittsburgh, PA USA
[4] Univ Texas MD Anderson Canc Ctr, Dept Thorac Head & Neck Med Oncol, Houston, TX 77030 USA
[5] Univ Texas MD Anderson Canc Ctr, Dept Head & Neck Surg, Houston, TX 77030 USA
[6] UPMC Hillman Canc Ctr, Div Hematol Oncol, Pittsburgh, PA USA