1. Department of Medicine, Lymphoma Service, Memorial Sloan Kettering Cancer Center, New York, NY, USA
2. Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
3. Department of Radiation Oncology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
4. Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, NY, USA;
5. Department of Medicine, Bone Marrow Transplant Service, Memorial Sloan Kettering Cancer Center, New York, NY, USA
6. Hematopathology Service, Memorial Sloan Kettering Cancer Center, New York, NY, USA