1. Department of Radiation Oncology, Mayo Clinic, Rochester, Minnesota
2. NRG Oncology Statistics and Data Management Center/American College of Radiology, Philadelphia, Pennsylvania
3. Department of Radiation Oncology, Rush University Medical Center, Chicago, Illinois
4. Department of Radiation Oncology, The University of Texas, MD Anderson Cancer Center, Houston
5. Department of Radiation Oncology, University of Maryland and Greenebaum Comprehensive Cancer Center, Baltimore
6. Department of Radiation Oncology, Albert Einstein Medical Center, Philadelphia, Pennsylvania
7. Department of Radiation Oncology, Montefiore Medical Center–Moses Campus, Bronx, New York
8. Department of Gastroenterology and Hepatology, University of Maryland and Greenebaum Cancer Center, Baltimore
9. Department of Radiation Oncology, Medical College of Wisconsin and Zablocki Veterans' Administration Medical Center, Milwaukee
10. Department of Radiation Oncology, Washington University School of Medicine in St Louis, St Louis, Missouri
11. Department of Radiation Oncology, University of Utah Health Science Center, Salt Lake City
12. Department of Radiation Oncology, Loma Linda University Cancer Institute, Loma Linda, California
13. Department of Radiation Oncology, Wayne State University/Karmanos Cancer Institute, Detroit, Michigan
14. Department of Medical Oncology, John H. Stroger Jr Hospital of Cook County, Chicago, Illinois
15. Department of Radiation Oncology, Fox Chase Cancer Center, Philadelphia, Pennsylvania
16. Department of Radiation Oncology, McMaster University, Juravinski Cancer Centre, Hamilton, Ontario, Canada
17. Department of Radiation Oncology, Christiana Care Health Services Inc Community Clinical Oncology Program, Newark, Delaware
18. Department of Radiation Oncology, University of Colorado, Aurora
19. Department of Radiation Oncology, US Oncology Texas Oncology-Sugar Land, Fort Worth
20. Department of Medicine, Hematology/Oncology, University of Rochester, Rochester, New York
21. Department of Radiation Oncology, Cleveland Clinic Foundation, Cleveland, Ohio
22. Department of Radiation Oncology, University of Alabama at Birmingham, Birmingham
23. Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, New York