1. Department of Physical Therapy, School of Nursing and Rehabilitation Sciences at Odawara, International University of Health and Welfare: 1-2-25 Shiroyama, Odawara-shi, Kanagawa 250-8588, Japan
2. Department of Computer and Information Sciences, Graduate School of Engineering, Tokyo University of Agriculture and Technology, Japan
3. Department of Prosthetics & Orthotics and Assistive Technology, Faculty of Medical Technology, Niigata University of Health and Welfare, Japan
4. Department of Medical Research and Management for Musculoskeletal Pain 22nd Century Medical and Research Center, Faculty of Medicine, The University of Tokyo Hospital, Japan
5. Department of Rehabilitation Medicine, The University of Tokyo Hospital, Japan