[1] Univ Texas MD Anderson Canc Ctr, Houston, TX 77030 USA
[2] Univ Texas MD Anderson Canc Ctr, Dept Biostat, Houston, TX 77030 USA
[3] Univ Texas MD Anderson Canc Ctr, Dept Head & Neck Surg, Houston, TX 77030 USA
[4] Baylor Coll Med, Houston, TX 77030 USA
[5] Univ Texas MD Anderson Canc Ctr, Dept Thorac & Head & Neck Med Oncol, Houston, TX 77030 USA
[6] Univ Texas MD Anderson Canc Ctr, Dept Head & Neck Surg, Houston, TX 77030 USA