1. Translational Research Program in Pediatric Orthopaedics, Division of Orthopaedic Surgery, Children’s Hospital of Philadelphia, Philadelphia, PA 19104, USA.
2. Department of Orthopaedics, The First Hospital of China Medical University, Liaoning 110001, China.
3. Division of Hematology, Children’s Hospital of Philadelphia, Philadelphia, PA 19104, USA.
4. Department of Orthopaedic Surgery, School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.