1. Department of Orthopaedic Surgery, Washington University, St. Louis, Missouri, USA
2. Shriners Hospitals for Children—St. Louis, St. Louis, Missouri, USA
3. Department of Cell Biology, Duke University Medical Center, Durham, North Carolina, USA
4. Cytex Therapeutics, Inc., Durham, North Carolina, USA
5. Department of Biomedical Engineering, Washington University, St. Louis, Missouri, USA
6. Department of Biomedical Engineering, Duke University, Durham, North Carolina, USA
7. Department of Orthopaedic Surgery, Stanford University School of Medicine, Stanford, California, USA