1. Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA;
2. Department of Biostatistics and Computational Biology, Dana-Farber Cancer Institute, Boston, MA; and
3. Division of Hematology, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA;
4. Division of Hematology, Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA; and
5. Division of Rheumatology, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA