1 Department of Radiation Oncology, Brigham and Women's Hospital and Dana-Farber Cancer Institute, Boston, Massachusetts; Harvard Medical School, Boston, Massachusetts.
2 Therapeutic Radiology, Yale, New Haven, Connecticut.
3 Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas.
4 Department of Radiation Oncology, University of Pennsylvania, Philadelphia, Pennsylvania.
5 University of Texas Southwestern Medical Center, Dallas, Texas.
6 Duke Cancer Center, Chapel Hill, North Carolina.
7 Regional Health John T. Vucurevich Cancer Institute, Rapid City, South Dakota.
8 Department of Radiation Oncology, Virginia Commonwealth University, Richmond, Virginia.