1. Division of Hematology, Yale University School of Medicine, New Haven, CT;
2. Division of Infectious Diseases, Boston Medical Center, Boston, MA;
3. Department of Laboratory Medicine, Yale University School of Medicine, New Haven, CT;
4. Division of Hematology and Blood Transfusion Service, Massachusetts General Hospital, Boston, MA;
5. Division of Hemostasis and Thrombosis, Beth Israel Deaconess Medical Center, Boston, MA; and
6. Harvard Medical School, Boston, MA