1. Department of Radiation Oncology, Rush University Medical Center, Chicago, Illinois
2. Robert H. Lurie Comprehensive Cancer Center, Division of Hematology and Medical Oncology, Northwestern University, Chicago, Illinois
3. Department of Radiation Oncology, University of North Carolina School of Medicine, Chapel Hill
4. Department of Radiation Oncology, Kaiser Permanente, Atlanta, Georgia
5. Department of Radiation Oncology, New York Proton Center, New York
6. Division of Hematology, Oncology and Stem Cell Transplant, Rush University Medical Center, Chicago, Illinois
7. John Theurer Cancer Center, Department of Radiation Oncology, Hackensack University Medical Center, Hackensack, New Jersey
8. Department of Radiation Oncology, University of Pennsylvania School of Medicine, Philadelphia