1. Laboratory of Periodontology and Immunology; Division of Oral Science for Health Promotion; Niigata University Graduate School of Medical and Dental Sciences; Niigata Japan
2. Division of Periodontology; Niigata University Graduate School of Medical and Dental Sciences; Niigata Japan
3. Division of Dental Educational Research Development; Niigata University Graduate School of Medical and Dental Sciences; Niigata Japan