1. Department of Radiation Oncology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
2. Departments of Radiation Oncology and Urology, Cleveland Clinic, Cleveland, Ohio
3. Department of Radiation Oncology, Case Western Reserve University School of Medicine, Cleveland, Ohio
4. Department of Radiation Oncology, University of Michigan, Ann Arbor
5. Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina
6. Department of Radiation Oncology, Washington University School of Medicine, St Louis, Missouri
7. Department of Radiation Oncology, Mayo Clinic, Rochester, Minnesota
8. Department of Radiation Oncology, University of Chicago, Chicago, Illinois
9. Department of Radiation Oncology, University of Miami, Miami, Florida
10. Department of Radiation Oncology, Hunter Holmes McGuire Veterans Affairs Medical Center, Richmond, Virginia
11. Department of Radiation Oncology, Virginia Commonwealth University Medical Center, Richmond
12. Department of Radiation Oncology, Sidney Kimmel Cancer Center at Thomas Jefferson University, Philadelphia, Pennsylvania