1. Department of Orthopaedic Surgery, Washington University in Saint Louis, Saint Louis, Missouri.
2. Shriners Hospitals for Children–St. Louis, St. Louis, Missouri.
3. Department of Cell Biology, Duke University, Durham, North Carolina.
4. University of California, San Francisco, San Francisco, California.
5. Cytex Therapeutics, Inc., Durham, North Carolina.
6. Department of Biomedical Engineering, Duke University, Durham, North Carolina.