1. Division of Periodontology, Department of Oral Biological Science, Faculty of Dentistry, Niigata University, Niigata, Japan
2. Research Center for Advanced Oral Science, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
3. Research Unit for Oral-Systemic Connection, Division of Oral Science for Health Promotion, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
4. Department of Periodontology, Faculty of Dentistry, Universitas Indonesia, Jakarta, Indonesia