[1] Indiana Univ, Melvin & Bren Simon Canc Ctr, Indianapolis, IN 46204 USA
[2] Johns Hopkins Univ, Sch Med, Div Biostat & Bioinformat, Baltimore, MD USA
[3] Johns Hopkins Univ, Sch Med, Baltimore, MD USA
[4] Univ Penn, Dept Radiat Oncol, Philadelphia, PA 19104 USA
[5] Indiana Univ, Dept Radiat Oncol, Indianapolis, IN 46204 USA
[6] Mayo Clin Arizona, Phoenix, AZ USA
[7] SUNY Upstate Med Univ, Syracuse, NY 13210 USA
[8] Univ Alabama Birmingham, Birmingham, AL USA
[9] Texas Oncol, Ft Worth, TX USA
[10] Michigan Canc Res Consortium CCOP, Ypsilanti, MI USA
[11] Univ Texas Southwestern Med Ctr Dallas, Dallas, TX 75390 USA
[12] Washington Univ, Sch Med, Dept Radiat Oncol, St Louis, MO USA
[13] Univ Pittsburgh, Pittsburgh, PA USA
[14] Christiana Care Hlth Syst, Newark, DE USA
[15] Case Western Reserve Univ, Sch Med, Cleveland, OH USA
[16] Emory Univ, Dept Radiat Oncol, Winship Canc Inst, Atlanta, GA 30322 USA
[17] NRG Oncol Stat & Data Management Ctr, Philadelphia, PA USA
[18] Washington Univ, Sch Med, St Louis, MO USA
[19] Indiana Univ Sch Med, Simon Canc Ctr, Dept Radiat Oncol, Indianapolis, IN 46202 USA