1. Department of Clinical Motor System Medicine; 22nd Century Medical & Research Center; Graduate School of Medicine, University of Tokyo; Tokyo
2. Department of Joint Disease Research; 22nd Century Medical & Research Center; Graduate School of Medicine, University of Tokyo; Tokyo
3. Department of Sensory & Motor System Medicine; Graduate School of Medicine, University of Tokyo; Tokyo
4. Department of Orthopaedic Surgery; Tokyo Metropolitan Geriatric Hospital; Tokyo
5. Research Team for Promoting Independence of the Elderly; Tokyo Metropolitan Institute of Gerontology; Tokyo
6. Research Institute; National Center for Geriatrics and Gerontology; Aichi
7. National Rehabilitation Center for Persons with Disabilities; Saitama Japan