1. Division of Microbiology and Infectious Diseases, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
2. Research Center for Advanced Oral Science, Niigata University, Graduate School of Medical and Dental Sciences, Niigata, Japan
3. Division of Periodontology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
4. Division of Oral Science for Health Promotion, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
5. Department of Microbiology and Infection Control Sciences, Kyoto Pharmaceutical University, Kyoto, Japan
6. Department of Laboratory Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan