1. Research Team for Promoting Independence of the Elderly; Tokyo Metropolitan Institute of Gerontology; Tokyo Japan
2. Graduate School, Section of Oral Health Care Education; Tokyo Medical and Dental University; Tokyo Japan
3. Department of Oral Disease; National Center for Geriatrics and Gerontology; Aichi Japan
4. Human Care Research Team; Tokyo Metropolitan Institute of Gerontology; Tokyo Japan
5. Research Team for Social Participation and Community Health; Tokyo Metropolitan Institute of Gerontology; Tokyo Japan
6. Department of Social Medicine, School of Medicine; Toho University; Tokyo Japan
7. Graduate School, Section of Behavioral Dentistry; Tokyo Medical and Dental University; Tokyo Japan