[1] Univ Minnesota, Dept Radiat Oncol, Minneapolis, MN USA
[2] Hosp Univ Miguel Servet Zaragoza, Zaragoza, Spain
[3] Amer Soc Radiat Oncol, Arlington, VA USA
[4] Johns Hopkins Univ, Baltimore, MD USA
[5] Ottawa Hosp, Div Radiat Oncol, Ottawa, ON, Canada
[6] Univ Ottawa, Ottawa, ON, Canada
[7] Ohio State Univ, Dept Radiat Oncol, Ctr Comprehens Canc, Columbus, OH USA
[8] Oregon Hlth & Sci Univ, Portland, OR USA
[9] Univ N Carolina, Chapel Hill, NC USA
[10] Beth Israel Deaconess Med Ctr, Dept Radiat Oncol, Boston, MA USA
[11] Med Coll Wisconsin, Milwaukee, WI USA
[12] Univ Penn, Philadelphia, PA USA
[13] Duke Univ, Med Ctr, Durham, NC USA
[14] Univ Washington, Dept Radiat Oncol, Fred Hutchinson Canc Ctr, Seattle, WA USA
[15] Univ Texas MD Anderson Canc Ctr, Dept Radiat Oncol, Houston, TX USA
[16] Mem Sloan Kettering Canc Ctr, Dept Radiat Oncol, New York, NY USA
[17] Stanford Univ, Dept Radiat Oncol, Sch Med, Stanford, CA USA
[18] Harvard Med Sch, Brigham & Womens Hosp, Dept Radiat Oncol, Dana Farber Canc Inst, Boston, MA USA