1. Faculty of Rehabilitation, Fujita Health University School of Health Sciences, Toyoake, Aichi, Japan
2. Department of Rehabilitation Medicine I, Fujita Health University School of Medicine, Toyoake, Aichi, Japan
3. Department of Rehabilitation Medicine, Takekawa Hospital, Itabashi, Tokyo, Japan
4. Assistive Robot Center, National Center for Geriatrics and Gerontology, Obu, Aichi, Japan