1. Johns Hopkins University School of Medicine, Department of Oncology, Baltimore, MD 21231 and Hopital Saint-Antoine, Department of Hematology and Department of Pathology A, 75012 Paris, France
2. Johns Hopkins University School of Medicine, Department of Oncology, Baltimore, MD 21231
3. Hopital Saint-Antoine, Department of Hematology and Department of Pathology A, 75012 Paris, France
4. University of Florida School of Medicine, Division of Hematology/Oncology, Gainesville, FL 32610-3001