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