1. Department of Removable Prosthodontics and Gerodontology; Tokyo Dental College; Tokyo Japan
2. Research Team for Promoting Independence and Mental Health; Tokyo Metropolitan Institute of Gerontology; Tokyo Japan
3. Department of Oral Surgery and Dentistry; Tokyo Metropolitan Geriatric Hospital; Tokyo Japan
4. Action Research Center for Community Prevention of Frailty; Tokyo Metropolitan Institute of Gerontology; Tokyo Japan
5. Research Team for Human Care; Tokyo Metropolitan Institute of Gerontology; Tokyo Japan