1. Removable Prosthodontics Nihon University Graduate School of Dentistry at Matsudo Chiba Japan
2. Research Team for Promoting Independence and Mental Health Tokyo Metropolitan Institute of Gerontology Tokyo Japan
3. Department of Removable Prosthodontics and Gerodontology Tokyo Dental College Tokyo Japan
4. Action Research Center for Community Prevention of Frailty Tokyo Metropolitan Institute of Gerontology Tokyo Japan
5. Division of Comprehensive Prosthodontics Niigata University Graduate School of Medical and Dental Sciences Niigata Japan
6. Department of Removable Prosthodontics Nihon University School of Dentistry at Matsudo Chiba Japan
7. Department of Dentistry and Oral SurgeryTokyo Metropolitan Geriatric Hospital Tokyo Japan