1. From the Program in Cellular and Molecular Medicine (N.S., D.C., D.D.W.), Boston Children’s Hospital, MA
2. Department of Pediatrics, Harvard Medical School, Boston, MA (N.S., D.C., D.D.W.)
3. Laboratory for Thrombosis Research, KU Leuven Campus Kulak Kortrijk, Belgium (K.M.)
4. Division of Hematology/Oncology (D.D.W.), Boston Children’s Hospital, MA