[1] Univ Texas, MD Anderson Canc Ctr, Dept Surg, 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 Radiat, Houston, TX 77030 USA
[4] Univ Texas, MD Anderson Canc Ctr, Pain Res Grp, Houston, TX 77030 USA
[5] Univ Texas, Hlth Sci Ctr, Dept Surg, Houston, TX 77030 USA