1. Division of Hematology and Oncology, University of Pennsylvania, Philadelphia, PA;
2. Hematology Division, Chaim Sheba Medical Center, Tel Aviv University, Tel-Hashomer, Israel;
3. Department of Pathology, University of Pittsburgh Medical Center, Pittsburgh, PA;
4. Janssen Research and Development, Spring House, PA;
5. Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA; and
6. Philadelphia Veterans Affairs Medical Center, Philadelphia, PA