1. Laboratory of Experimental Thrombosis, Institute of Experimental Medicine, National Scientific and Technical Research Council, National Academy of Medicine, Buenos Aires, Argentina;
2. Program in Cellular and Molecular Medicine, Boston Children’s Hospital, Boston, MA;
3. Department of Pediatrics, and
4. Immunology Graduate Program, Division of Medical Sciences, Harvard Medical School, Boston, MA; and
5. Division of Hematology/Oncology, Boston Children’s Hospital, Boston, MA