1. Department of Restorative Dentistry and Endodontology Kagoshima University Graduate School of Medical and Dental Sciences Kagoshima Japan
2. Department of Bacteriology Hiroshima University Graduate School of Biomedical and Health Sciences Hiroshima Japan
3. Department of Periodontal Medicine Hiroshima University Graduate School of Biomedical and Health Sciences Hiroshima Japan
4. Department of Oral Microbiology Kagoshima University Graduate School of Medical and Dental Sciences Kagoshima Japan