1. Section of Orthopaedics, University of Medicine and Dentistry of New Jersey, 185 South Orange Avenue, MSB—G574, Newark, NJ 07163
2. Department of Bioengineering, Hospital for Joint Diseases Orthopaedic Institute, 301 East 17th Street, New York, NY 10003
3. Department of Biology, University of Dayton, 300 College Park, Dayton, OH 45469