1. University of Chicago Comprehensive Cancer Center, Chicago, Illinois
2. NRG Oncology Statistics and Data Management Center, Philadelphia, Pennsylvania
3. Department of Radiation Oncology, Washington University in St Louis, St Louis, Missouri
4. Department of Medicine-Medical Oncology, Mayo Clinic, Rochester, Minnesota
5. University of Colorado-Anschutz Medical Center, Aurora
6. Department of Radiation Oncology, University of Michigan, Ann Arbor
7. Department of Radiation Oncology, University of Arizona Medical Center – University Campus, Tucson
8. Ohio State University Comprehensive Cancer Center, Columbus
9. Centre Hospitalier de L’Universite de Montréal, Hotel Dieu de Montréal, Montréal, Quebec, Canada
10. Heartland Cancer Research National Cancer Institute Community Oncology Research Program, Decatur, Illinois
11. Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina
12. New Mexico Minority Underserved National Cancer Institute Community Oncology Research Program, Albuquerque
13. Department of Radiation Oncology, University of Rochester, Rochester, New York
14. Fox Chase Cancer Center, Philadelphia, Pennsylvania