1. Department of Oral Disease Research, Geroscience Research Center National Center for Geriatrics and Gerontology Obu Japan
2. Department of Geriatric Oral Science, Graduate School of Dentistry Tohoku University Sendai Japan
3. Section of Community Oral Health and Epidemiology, Division of Oral Health, Technology and Epidemiology, Faculty of Dental Science Kyushu University Fukuoka Japan
4. Department of Operative Dentistry, School of Dentistry Aichi Gakuin University Nagoya Japan