1. Myeloma Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY;
2. Department of Medicine, Weill Medical College of Cornell University, New York, NY;
3. Division of Hematology and Oncology, Massachusetts General Hospital Cancer Center, Harvard Medical School, Boston, MA;
4. Department of Biostatistics and Epidemiology, Memorial Sloan Kettering Cancer Center, New York, NY; and
5. Adult Bone Marrow Transplant Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY