1. Gerodontology, Department of Oral Health Science, Faculty of Dental Medicine Hokkaido University Sapporo Japan
2. Department of Public Health and Hygiene Graduate School of Medicine, University of the Ryukyus Okinawa Japan
3. Research Team for Promoting Independence and Mental Health, Tokyo Metropolitan Institute for Geriatrics and Gerontology Tokyo Japan
4. Department of Preventive Dentistry, Faculty of Dental Medicine and Graduate School of Dental Medicine Hokkaido University Sapporo Japan
5. Department of Prosthodontics, Gerodontology and Oral Rehabilitation Osaka University Graduate School of Dentistry Osaka Japan
6. Tottori Dental Association Tottori Japan