1. Orthopedic Research Laboratories, Department of Orthopaedic Surgery, Stanford University School of Medicine, Stanford, California, USA.
2. Department of Orthopedic Surgery, Center for Cellular and Molecular Engineering, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA.
3. Tulane Center for Stem Cell Research and Regenerative Medicine and Department of Pharmacology, Tulane University School of Medicine, New Orleans, Louisiana, USA.