1. Division of Periodontology, Department of Oral Biological Science, Niigata University Graduate School of Medical and Dental Science, 2-5274 Gakko-cho, Chuo-ku, Niigata 951-8514, Japan
2. Research Unit for Oral-Systemic Connection, Division of Oral Science for Health Promotion, Niigata University Graduate School of Medical and Dental Sciences, 2-5274 Gakko-cho, Chuo-ku, Niigata 951-8514, Japan
3. Department of Clinical Nutrition Science, Niigata University Graduate School of Medical and Dental Sciences, Chuo-ku, Niigata 951-8510, Japan
4. Research Centre for Advanced Oral Science, Niigata University Graduate School of Medical and Dental Sciences, 2-5274 Gakko-cho, Chuo-ku, Niigata 951-8514, Japan
5. Division of Clinical Nephrology and Rheumatology, Niigata University Graduate School of Medical and Dental Sciences, Chuo-ku, Niigata 951-8510, Japan
6. Reagent R&D Department, Denka Seiken Co. Ltd., 1359-1, Kagamida, Kigoshi, Gosen-shi, Niigata 959-1695, Japan
7. Department of Laboratory Medicine and Clinical Epidemiology for Prevention of Noncommunicable Diseases, Niigata University Graduate School of Medical and Dental Sciences, Chuo-ku, Niigata 951-8510, Japan
8. Department of Applied Molecular Medicine, Niigata University Graduate School of Medical and Dental Sciences, Chuo-ku, Niigata 951-8510, Japan