1. Department of Orthopaedic Surgery, Perelman School of MedicineUniversity of Pennsylvania Philadelphia PA
2. Department of OrthopaedicsUnion Hospital, Tongji Medical College, Huazhong University of Science and Technology Wuhan China
3. Department of Physical Medicine and Rehabilitation, Perelman School of MedicineUniversity of Pennsylvania Philadelphia PA
4. Translational Musculoskeletal Research Center (TMRC)Corporal Michael J. Crescenz Veterans Affairs Medical Center Philadelphia Pennsylvania