1. Department of Dental Hygiene, Kanagawa Dental University Junior College, Yokosuka, Japan;
2. Division of Environmental Pathology, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Japan;
3. Department of Food and Nutrition, Koriyama Women’s University, Koriyama, Japan;
4. Division of Dental Anatomy, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Japan;
5. Department of Highly Advanced Stomatology, Graduate School of Dentistry, Kanagawa Dental University, Yokohama, Japan;
6. Division of Periodontology, Department of Oral Interdisciplinary Medicine, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Japan;
7. R&D Division, Food Microbiology Research Laboratories, Meiji Co. Ltd., Hachioji, Japan;
8. Department of Drug Discovery Sciences, Kitasato Institute for Life Sciences, Kitasato University, Tokyo, Japan;
9. Honobono, Elderly Nursing Home, Yokohama, Japan;
10. Elderly Nursing Home, Yokohama, Japan