1. Division of Aging and Geriatric Dentistry; Department of Oral Function and Morphology; Graduate School of Dentistry; Sendai Japan
2. Japanese Red Cross Ishinomaki Hospital; Ishinomaki Japan
3. Division of Public Health; Hygiene, and Epidemiology; Faculty of Medicine; Tohoku Medical and Pharmaceutical University Japan
4. Department of Community Medical Supports; Tohoku Medical Megabank Organization; Tohoku University; Sendai Japan
5. Division of Epidemiology; Department of Health Informatics and Public Health; School of Public Health; Graduate School of Medicine; Tohoku University; Sendai Japan
6. Department of Social Welfare; Faculty of General Welfare; Tohoku Fukushi University; Sendai Japan