1. Tokyo Metropolitan Institute of Gerontology Tokyo Japan
2. Division of Preventive Dentistry Department of Oral Health Science Niigata University Graduate School of Medical and Dental Sciences Niigata Japan
3. Division of Oral Science for Health Promotion Department of Oral Health and Welfare Niigata University Graduate School of Medical and Dental Sciences Niigata Japan
4. Department of Health and Nutrition Niigata University of Health and Welfare Niigata Japan
5. Division of Preventive Medicine Niigata University Graduate School of Medical and Dental Sciences Niigata Japan
6. Division of Community Oral Health DevelopmentKyushu Dental University Kitakyushu Japan