1. Division of Aging and Geriatric Dentistry, Department of Oral Function and Morphology, Tohoku University Graduate School of Dentistry
2. Japanese Red Cross Ishinomaki Hospital
3. Division of Epidemiology, Department of Health Informatics and Public Health, Tohoku University School of Public Health, Graduate School of Medicine
4. Department of Social Welfare, Faculty of General Welfare, Tohoku Fukushi University