1. 1Department of Radiation Oncology, UCLA, Los Angeles, California.
2. 2NRG Oncology Statistics and Data Management Center, Philadelphia, Pennsylvania.
3. 3Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, Maryland.
4. 4MD Anderson Cancer Center, Houston, Texas.
5. 5Helen F Graham Cancer Center and Research Institute and Medical Oncology Hematology Consultants Pa, Newark, Delaware.
6. 6Thomas Jefferson University Hospital, Philadelphia, Pennsylvania.
7. 7Upstate Medical University (accruals Thomas Jefferson University Hospital), Syracuse, New York.
8. 8Mayo Clinic, Rochester, Minnesota.
9. 9St. Joseph Mercy Cancer Center (accruals Michigan Cancer Research Consortium CCOP), Ypsilanti, Michigan.
10. 10Washington University, St. Louis, Missouri.
11. 11Texas Oncology Cancer Center Sugar Land, Sugar Land, Texas.
12. 12UPMC-Shadyside Hospital, Pittsburgh, Pennsylvania.
13. 13Helen F Graham Cancer Center (accruals Christiana Care Health Services, Inc. CCOP), Newark, Delaware.
14. 14Medical College of Wisconsin and the Zablocki VAMC, Milwaukee, Wisconsin.
15. 15The Ottawa Hospital, Ottawa, Ontario, Canada.
16. 16Emory University School of Medicine, Atlanta, Georgia.