1. From the Division of Aging and Geriatric Dentistry (S.Y., T.M., T.K., T. Ohi, Y.M., K.E., T.H., Y.H.), Department of Rehabilitation Dentistry, Tohoku University Graduate School of Dentistry; Division of Public Health, Hygiene and Epidemiology (T.M., M.S., H.M.), Faculty of Medicine, Tohoku Medical and Pharmaceutical University; Department of Preventive Medicine and Epidemiology (T.M., M.S., M.K., A. Hozawa, H.M.), Tohoku Medical Megabank Organization, Tohoku University, Sendai; Japanese Red Cross...