1. William Beaumont Hospital, Royal Oak, Michigan, USA
2. NRG Oncology Statistics and Data Management Center, Philadelphia, Pennsylvania, USA
3. Dana-Farber/Harvard Cancer Center, Boston, Massachusetts, USA
4. Augusta University–Medical College of Georgia, Augusta, Georgia, USA
5. Thomas Jefferson University Hospital, Philadelphia, Pennsylvania, USA
6. Massachusetts General Hospital, Boston, Massachusetts, USA
7. Barrow Neurological Institute accruals under Arizona Oncology Services Foundation, Phoenix, Arizona, USA
8. H. Lee Moffitt Cancer, Tampa, Florida, USA
9. Novant Health Forsyth Regional Cancer Center accruals under Southeast Cancer Control Consortium, Inc, CCOP, Goldsboro, North Carolina, USA
10. The Ottawa Hospital Regional Cancer Centre, Ottawa, Ontario, Canada
11. University of Alabama at Birmingham Medical Center, Birmingham, Alabama, USA
12. University of Rochester, Rochester, New York, USA
13. Cleveland Clinic Foundation, Cleveland, Ohio, USA
14. Willamette Valley Cancer Institute, Eugene, Oregon, USA
15. Saint Joseph Mercy Hospital accruals under Michigan Cancer Research Consortium CCOP, Ypsilanti, Michigan, USA
16. Legacy Health Systems accruals under Mayo Clinic, Portland, Oregon, USA
17. Baptist Hospital of Miami, Miami, Florida, USA