1. Translational Musculoskeletal Research CenterCorporal Michael J. Crescenz VA Medical Center Philadelphia Pennsylvania USA
2. McKay Orthopaedic Research Laboratory, Department of Orthopaedic SurgeryUniversity of Pennsylvania Philadelphia Pennsylvania USA
3. School of Biomedical Engineering, Science and Health SystemsDrexel University Philadelphia Pennsylvania USA
4. Department of BioengineeringUniversity of Pennsylvania Philadelphia Pennsylvania USA