1. 1Section of Hematology/Oncology, Boston Medical Center, Boston, MA
2. 2Hematology and Oncology Department, Veterans Administration Boston Healthcare System, West Roxbury, MA
3. 3Cooperative Studies Program Informatics Center, Massachusetts Veterans Epidemiology Research and Information Center, Boston, MA
4. 4Section of General Internal Medicine, Department of Medicine, Boston Medical Center, Boston, MA
5. 5Jerome Lipper Multiple Myeloma Center, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA