1. Institute of Gerontology The University of Tokyo Tokyo Japan
2. Tokyo Metropolitan Institute for Geriatrics and Gerontology Tokyo Japan
3. Department of Removable Prosthodontics and Gerodontology, Graduate School of Dentistry Osaka University Osaka Japan
4. Department of Removable Prosthodontics and Gerodontology Tokyo Dental College Tokyo Japan
5. Division of Preventive Dentistry, Department of Oral Health Science, Graduate School of Dental Medicine Hokkaido University Sapporo Japan
6. Department of Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences Tokyo Medical and Dental University Tokyo Japan
7. Department of Geriatric Medicine, Graduate School of Medicine The University of Tokyo Tokyo Japan
8. National Center for Geriatrics and Gerontology Obu Japan
9. Institute for Future Initiatives The University of Tokyo Tokyo Japan