1. Department of Orthopedic Surgery, Rush Medical College, Rush University Medical Center, Chicago, Illinois.
2. Department of Orthopedic Surgery, Chiba Graduate School of Medicine, Chiba University, Chiba, Japan.
3. Department of Bioengineering, University of California, San Diego, La Jolla, California.
4. Department of Orthopedic Surgery, Teikyo University Chiba Medical Center, Chiba, Japan.
5. Pentax Inc., Tokyo, Japan.
6. Department of Biochemistry, Rush Medical College, Rush University Medical Center, Chicago, Illinois.
7. Current affiliation: Department of Orthopaedic Surgery, University of California, San Diego, La Jolla, California.