1. Biometrics Research Laboratory, NEC Corporation, Abiko, Chiba, Japan
2. Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology, Takamatsu, Kagawa, Japan
3. Human Augmentation Research Center, National Institute of Advanced Industrial Science and Technology, Kashiwa, Chiba, Japan
4. Division of Medical Design Innovations, Open Innovation Center, Institute of Research Innovation, Tokyo Medical and Dental University, Tokyo, Japan
5. Department of Orthopaedic and Spinal Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan