Affiliation: | 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, Department of Oral Biological Science, Niigata University Graduate School of Medical and Dental Sciences, , Niigata, Japan;3. General Dentistry and Clinical Education Unit, Niigata University Medical and Dental Hospital, , Niigata, Japan |