1. Department of Physical Therapy, Faculty of Health and Medical Sciences, Tokoha University: 1230 Miyakoda-cho, Kita-ku, Hamamatsu-shi, Shizuoka 431-2102, Japan
2. Department of Computer Science, Graduate School of System Design, Tokyo Metropolitan University, Japan
3. Department of Rehabilitation, Seirei Hamamatsu General Hospital, Japan
4. Department of Rehabilitation, Yamauchi Orthopedic Clinic, Japan
5. Department of Rehabilitation, Iwata City Hospital, Japan
6. Department of Rehabilitation, Seisei Rehabilitation Hospital, Japan
7. Department of Mechanical Systems, Graduate School of Engineering, Nagoya University, Japan