Affiliation: | 1. Tokyo Metropolitan Institute of Gerontology, Tokyo, Japan;2. Institute of Gerontology, The University of Tokyo, Tokyo, Japan;3. Gerodontology, Department of Oral Health Science, Faculty of Dental Medicine, Hokkaido University, Sapporo, Japan;4. Department of Geriatric Medicine, The University of Tokyo, Tokyo, Japan;5. Haradoi Hospital Department of Dentistry, Hukuoka, Japan |