1. The Ohio State University Comprehensive Cancer Center, Columbus, OH;
2. The University of Pittsburgh, Pittsburgh, PA;
3. University Hospitals, Case Western Reserve University, Cleveland, OH;
4. The Orlando Health Cancer Institute, Orlando, FL;
5. University of California at Los Angeles, Los Angeles, CA;
6. Department of Radiation Oncology, University of Michigan, Ann Arbor, MI;
7. NRG Oncology Biostatistical Center, Pittsburgh, PA;
8. Washington University School of Medicine, St. Louis, MO;
9. CHU de Quebec-Universite Laval and CCTG, Quebec City, QC, Canada;
10. Memorial Sloan Kettering Cancer Center, Weill Cornell Medical School and Alliance, New York, NY;
11. Department of Radiation Oncology, Indiana University School of Medicine and ECOG-ACRIN, Indianapolis, IN;
12. Mayo Clinic and SWOG, Rochester, MN;
13. Medical College of Wisconsin, Milwaukee, WI;
14. The Allegheny Health Network Cancer Institute, Pittsburgh, PA;
15. NRG Oncology and the Department of Biostatistics, University of Pittsburgh, Pittsburgh, PA;