1. Department of Radiation Oncology, Dana-Farber Cancer Institute, Brigham and Women's Hospital, and Children's Hospital, Boston, MA;
2. Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, CT;
3. Department of Medical Oncology/Hematologic Malignancies, Dana-Farber Cancer Institute and Brigham and Women's Hospital, Boston, MA;
4. Department of Radiation Oncology, Beth Israel Deaconess Medical Center, Boston, MA; and
5. Department of Cardiology, Children's Hospital Boston and Department of Medicine, Dana-Farber Cancer Institute, Brigham and Women's Hospital, Boston, MA