1 Laboratory for Clinical Evaluation with Robotics, Center of Assistive Robotics and Rehabilitation for Longevity and Good Health, National Center for Geriatrics and Gerontology, Obu, Japan.
2 Department of Rehabilitation Medicine, National Center for Geriatrics and Gerontology, Obu, Japan.
3 Center of Assistive Robotics and Rehabilitation for Longevity and Good Health, National Center for Geriatrics and Gerontology, Obu, Japan.