1. Department of Orthopaedic Surgery, Surgical Science, Tokai University School of Medicine, Isehara, Kanagawa, Japan.
2. Departments of Bioengineering and Mechanical Engineering, School of Engineering, University of Tokyo, Tokyo, Japan.
3. Division of Biomedical Material and Systems, Faculty of Medicine, Center for Disease Biology and Integrative Medicine, The University of Tokyo, Tokyo, Japan.