1. Massey Cancer Center, Virginia Commonwealth University, Richmond
2. NRG Oncology Statistics and Data Management Center, Philadelphia, Pennsylvania
3. University of Texas MD Anderson Cancer Center, Houston
4. Rutgers Cancer Institute of New Jersey, New Brunswick
5. Thomas Jefferson University Hospital, Philadelphia, Pennsylvania
6. Fox Chase Cancer Center, Philadelphia, Pennsylvania
7. Memorial Sloan Kettering Cancer Center, New York, New York
8. University of Maryland/Greenebaum Cancer Center, Baltimore, Maryland
9. Michigan Cancer Research Consortium, Ypsilanti
10. Cape Cod Hospital, Hyannis, Massachusetts
11. Wake Forest University Health Sciences, Winston-Salem, North Carolina
12. Froedtert and the Medical College of Wisconsin, Milwaukee
13. University of Colorado Hospital, Aurora
14. University of Michigan Comprehensive Cancer Center, Ann Arbor
15. Ohio State University Comprehensive Cancer Center, Columbus