1. Department of Orthopaedic Surgery, Washington University in St. Louis, St. Louis, MO 63110, USA.
2. Shriners Hospitals for Children, St. Louis, MO 63110, USA.
3. Center of Regenerative Medicine, Washington University in St. Louis, St. Louis, MO 63110, USA.
4. Department of Orthopaedic Surgery, Yonsei University College of Medicine, Seoul, South Korea.
5. Division of Rheumatology, Department of Medicine, Washington University in St. Louis, St. Louis, MO 63110, USA.
6. Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, MO 63130, USA.
7. Cytex Therapeutics Inc., Durham, NC 27704, USA.
8. Department of Biomedical Engineering, Vanderbilt University, Nashville, TN 37235, USA.
9. Center for Stem Cell Biology, Vanderbilt University, Nashville, TN 37235, USA.