1. National Center for Geriatrics and Gerontology; Obu Japan
2. Department of Rehabilitation Medicine; Yokohama City University Medical Center; Yokohama Japan
3. Department of Rehabilitation Medicine; Kumamoto Rehabilitation Hospital; Kumamoto Japan
4. Department of Lifespan Developmental Sciences, Graduate School of Comprehensive Human Sciences; University of Tsukuba; Japan
5. Research Team for Promoting Independence of the Elderly; Tokyo Metropolitan Institute of Gerontology; Tokyo Japan