[1] Yale Univ, Sch Med, New Haven, CT USA
[2] Carolinas Healthcare Syst, Levine Canc Inst, Charlotte, NC USA
[3] Yale Univ, Sch Med, Dept Med Oncol, New Haven, CT USA
[4] MDACC, Houston, TX USA
[5] Yale Univ, New Haven, CT USA
[6] Univ Texas MD Anderson Canc Ctr, Dept Thorac Head & Neck Med Oncol, Houston, TX 77030 USA
[7] Univ Texas MD Anderson Canc Ctr, Houston, TX 77030 USA
[8] Univ Texas MD Anderson Canc Ctr, Dept Biostat, Houston, TX 77030 USA