1. Division of Hematology, The Children’s Hospital of Philadelphia, Philadelphia, PA;
2. Université Pierre et Marie Curie Paris 06, UMR_S938, and Assistance Publique–Hôpitaux de Paris, Paris, France; and
3. Department of Pathology and Laboratory Medicine, and
4. Division of Hematology, Center for Cellular and Molecular Therapeutics, The Children’s Hospital of Philadelphia, Philadelphia, PA