1. Department of Orthopaedic Surgery, Keck School of Medicine of USC, University of Southern California (USC), Los Angeles, CA 90033, USA.
2. Ontario Veterinary College, Department of Clinical Studies, University of Guelph, ON N1G 2W1, Canada.
3. UCLA Department of Orthopaedic Surgery, David Geffen School of Medicine at UCLA, University of California, Los Angeles, CA 90095, USA.
4. Department of Pathology, Keck School of Medicine of USC, University of Southern California (USC), Los Angeles, CA 90033, USA.
5. International Research Center of Wound Repair and Regeneration (iWRR), National Cheng Kung University, Tainan 701401 Taiwan.
6. Broad Center for Regenerative Medicine and Stem Cell Research, Keck School of Medicine of USC, University of Southern California (USC), Los Angeles, CA 90033, USA.