1. Division of Periodontology, Department of Oral Biological Science, Graduate School of Medical and Dental Sciences Niigata University Niigata Japan
2. General Dentistry and Clinical Education Unit Niigata University Medical and Dental Hospital Niigata Japan
3. Niigata Rheumatic Center Shibata Japan
4. Division of Clinical Nephrology and Rheumatology, Department of Homeostatic Regulation Developments, Graduate School of Medical and Dental Sciences Niigata University Niigata Japan