1. Department of Orthopaedic Surgery, Dokkyo University School of Medicine, 880-Kitakobayashi, Mibu, Tochigi, Japan.
2. Department of Bioengineering, National Cardiovascular Center Research Institute, 5-7-1 Fujishiro-dai, Suita, Osaka, Japan.
3. Department of Biomedical Engineering, Kyushu University, Maidashi 3-1-1, Higashi-ku, Fukuoka, Japan.
4. Department of Orthopaedic Surgery, Saitama Medical School, 38 Morohongo, Moroyama-Machi, Iruma-Gun, Saitama-Ken, Japan.
5. Department of Orthopaedic Surgery, Faculty of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-Ku, Tokyo, Japan.
6. Department of Information Physics and Computing, Center of Collaborative Research, University of Tokyo, Komaba 4-6-1, Meguro-ku, Tokyo, Japan.