1. Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY;
2. New York Institute of Technology College of Osteopathic Medicine, Old Westbury, NY;
3. Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, NY;
4. Department of Radiation Oncology, University of North Carolina School of Medicine, Chapel Hill, NC;
5. Department of Radiation Oncology, Washington University School of Medicine, St. Louis, MO;
6. National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China; and
7. Lymphoma Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY