[1] Univ Texas MD Anderson Canc Ctr, Houston, TX 77030 USA
[2] Univ Texas MD Anderson Canc Ctr, Dept Radiat Oncol, Houston, TX 77030 USA
[3] UT Southwestern Simmons Canc Ctr Dallas, Dallas, TX USA
[4] Univ Texas MD Anderson Canc Ctr, Dept Biostat, Houston, TX 77030 USA
[5] Univ Colorado, Dept Med Oncol, Denver, CO 80202 USA
[6] Univ Colorado, Aurora, CO USA
[7] Univ Colorado Denver, Dept Radiat Oncol, Aurora, CO USA
[8] Univ Texas MD Anderson Canc Ctr, Dept Thorac Head & Neck Oncol, Houston, TX 77030 USA
[9] Univ Colorado, Denver, CO 80202 USA
[10] London Hlth Sci Ctr, London, ON, Canada
[11] London Reg Canc Program, London, ON, Canada
[12] Univ Texas MD Anderson Canc Ctr, Dept Thorac & Cardiovasc Surg, Houston, TX 77030 USA