1. Blood Transfusion Service, Department of PathologyMassachusetts General Hospital Boston Massachusetts
2. Harvard Medical School Boston Massachusetts
3. Department of MedicineMassachusetts General Hospital Boston Massachusetts
4. Division of Hemostasis and ThrombosisBeth Israel Deaconess Medical Center Boston Massachusetts
5. Department of MedicineUniversity of Washington Medical Center Seattle Washington
6. Department of PathologyBeth Israel Deaconess Medical Center Boston Massachusetts
7. Department of PathologyBrigham and Womenʼs Hospital Boston Massachusetts
8. Division of HematologyMassachusetts General Hospital Boston Massachusetts