1. Division of Internal Medicine of the Department of Medicine, George Washington University School of Medicine and Health Sciences, Washington, DC, USA
2. Division of Hematology Oncology, George Washington University School of Medicine and Health Sciences, Washington, DC, USA
3. Hematology Section, Medical Service, Veterans Affairs Medical Center, Washington, DC, USA
4. Department of Pathology, George Washington University School of Medicine and Health Sciences, Washington, DC, USA
5. Pathology and Laboratory Medicine Service, Veterans Affairs Medical Center, Washington, DC, USA