[1] BC Canc Agcy, Kelowna, BC, Canada
[2] NRG Oncol Stat & Data Management Ctr, Philadelphia, PA USA
[3] Mayo Clin, Dept Radiat Oncol, Rochester, MN USA
[4] Univ Tennessee, Ctr Hlth Sci, Memphis, TN 38163 USA
[5] John Muir Hlth Syst, Walnut Creek, CA USA
[6] Sunnybrook Hlth Sci Ctr, Odette Canc Ctr, Toronto, ON, Canada
[7] Univ Hlth Network, Princess Margaret Canc Ctr, Radiat Med Program, Toronto, ON, Canada
[8] Washington Univ, Sch Med, St Louis, MO USA
[9] Univ Calif San Francisco, Helen Diller Family Comprehens Canc Ctr, San Francisco, CA 94143 USA
[10] Canc Ctr Northern Arizona, Sedona, AZ USA
[11] Fox Chase Canc Ctr, 7701 Burholme Ave, Philadelphia, PA 19111 USA
[12] Emory Univ, Dept Radiat Oncol, Atlanta, GA 30322 USA
[13] Emory Univ, Winship Canc Inst, Atlanta, GA 30322 USA
[14] CHU Quebec, Radiat Oncol, Quebec City, PQ, Canada
[15] Jefferson Univ, Philadelphia, PA USA
[16] Cross Canc Inst, Edmonton, AB, Canada
[17] Christiana Care Hlth Serv Inc, CCOP, Newark, DE USA
[18] Cedars Sinai Med Ctr, Los Angeles, CA 90048 USA