1. Department of Oral Health Education, Graduate School of Medical and Dental Sciences; Tokyo Medical and Dental University; Tokyo Japan
2. Human Care Research Team; Tokyo Metropolitan Institute of Gerontology; Tokyo Japan
3. Department of Behavioral Dentistry, Graduate School of Medical and Dental Sciences; Tokyo Medical and Dental University; Tokyo Japan
4. Dentistry and Oral Surgery; Tokyo Metropolitan Geriatric Hospital; Tokyo Japan
5. Research Team for Promoting Independence of the Elderly; Tokyo Metropolitan Institute of Gerontology; Tokyo Japan