1. Department of Bioengineering, University of Pennsylvania, Philadelphia, PA 19104, USA.
2. Department of Orthopaedic Surgery, University of Pennsylvania, Philadelphia, PA 19104, USA.
3. Translational Musculoskeletal Research Center, Corporal Michael J. Crescenz VA Medical Center, Philadelphia, PA 19104, USA.
4. Department of Clinical Studies, New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19348, USA.
5. Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA.
6. Department of Pathobiology, New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19348, USA.