[1] Radiation Oncology Flight, Lackland Air Force Base, Wilford Hall Medical Center, TX, United States
[2] Department of Radiation Oncology, University of Texas M. D. Anderson Cancer Center, Houston, TX, United States
[3] Department of Radiation Oncology, Virginia Commonwealth University Medical College of Virginia, Richmond, VA, United States
[4] Department of Radiation Oncology, University of Texas M. D. Anderson Cancer Center, Houston, TX, United States
[5] Department of Radiation Oncology, University of Medicine and Dentistry New Jersey, Robert Wood Johnson Medical School, New Brunswick, NJ, United States
[6] Department of Radiation Oncology, Duke University Medical School, Durham, NC, United States
[7] Shaw Regional Cancer Center, Vail, CO, United States
[8] Department of Human Oncology, Allegheny General Hospital, Pittsburgh, PA, United States
[9] Department of Radiation Oncology, University of North Carolina Medical School, Chapel Hill, NC, United States
[10] Department of Radiation Oncology, William Beaumont Hospital, Royal Oak, MI, United States
[11] Department of Radiation Oncology, Juravinski Cancer Center, Hamilton, Ont., Canada
[12] Department of Radiation Oncology, Medical College of Wisconsin, Milwaukee, WI, United States
[13] Radiation Oncology Residency Program, Harvard Medical School, Boston, MA, United States
[14] Department of Radiation Oncology, Dana-Farber Cancer Institute, Brigham and Women's Hospital, Boston, MA, United States