1. Harvard Radiation Oncology Program, Brigham and Women's Hospital; Dana-Farber Cancer Institute; Boston Massachusetts
2. Department of Radiation Oncology, Brigham and Women's Hospital; Dana-Farber Cancer Institute; Boston Massachusetts
3. Department of Statistics; University of Connecticut; Storrs Connecticut
4. Department of Pathology; Baptist Hospital and Miami Cancer Institute; Miami Florida
5. Department of Medicine; Memorial Sloan Kettering Cancer Center; New York New York