1. Department of Orthopaedic Surgery, Osaka-Minami National Hospital, Osaka, Japan.
2. Department of Orthopaedic Surgery, National Defense Medical College, Tokorozawa, Japan.
3. Skeletal Research Center, Department of Biology, Case Western Reserve University. Cleveland, Ohio.
4. Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, Ohio.
5. Department of Orthopaedics, Case Western Reserve University and University Hospitals, Cleveland, Ohio.