1. Division of Hematology, Department of Pediatrics, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
2. Cell Therapy and Transplant Section, Division of Oncology, Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA.
3. Cell and Molecular Biology Affinity Group (CAMB)—Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA.
4. Penn Center for Musculoskeletal Disorders, University of Pennsylvania, Philadelphia, Pennsylvania, USA.