1. Research Unit for Oral-Systemic Connection; Niigata University Graduate School of Medical and Dental Sciences; Niigata Japan
2. Division of Oral Science for Health Promotion; Niigata University Graduate School of Medical and Dental Sciences; Niigata Japan
3. Division of Periodontology; Department of Oral Biological Science; Niigata University Graduate School of Medical and Dental Sciences; Niigata Japan