1. Research Team for Promoting Independence of the Elderly; Tokyo Metropolitan Institute of Gerontology; Tokyo Japan
2. Center for Gerontology and Social Science; National Center for Geriatrics and Gerontology; Aichi Japan
3. Department of Oral Health Education, Graduate School of Medical and Dental Science; Tokyo Medical and Dental University; Tokyo Japan
4. Division of Clinical Oral Rehabilitation; The Nippon Dental University Graduate School of Life Dentistry; Tokyo Japan
5. Research Institute for Gerontology; J. F. Oberlin University; Tokyo Japan