1. Department of Radiation Oncology, The Ohio State University, Columbus
2. Statistics and Data Management Center, NRG Oncology, Philadelphia, Pennsylvania
3. Department of Radiation Oncology, London Regional Cancer Program, London, Ontario, Canada
4. Department of Oncology, London Regional Cancer Program, London, Ontario, Canada
5. Center for Biostatistics, Department of Biomedical Informatics, The Ohio State University, Columbus
6. Department of Hematology and Oncology, Wake Forest University School of Medicine, Winston-Salem, North Carolina
7. Department of Pathology, Toronto General Hospital/Princess Margaret, Toronto, Ontario, Canada
8. Department of Neurology, St Joseph’s Hospital and Medical Center–Accruals Arizona Oncology Services Foundation, Phoenix
9. Department of Radiation Oncology, Thomas Jefferson University Hospital, Philadelphia, Pennsylvania
10. Department of Radiation Oncology, Henry Ford Hospital, Detroit, Michigan
11. Department of Radiation Oncology, Centre Hospitalier de L`Université de Montréal-Notre Dame, Montreal, Quebec, Canada
12. Department of Radiation Oncology, University of Maryland Medical Systems, Baltimore
13. Department of Radiation Oncology, H. Lee Moffitt Cancer Center & Research Institute, Tampa, Florida
14. Department of Radiation Oncology, Mayo Clinic, Rochester, Minnesota
15. Department of Radiation Oncology, Medical College of Wisconsin, Milwaukee
16. Department of Obstetrics and Gynecology, University of Washington Medical Center-Accruals University of California San Francisco, Seattle
17. Departments of Medicine, Human Oncology and Neurology, University of Wisconsin Hospital, Madison
18. Department of Radiation Oncology, Baptist Hospital of Miami, Miami, Florida