1. Department of Cardiovascular Medicine, Graduate School of Biomedical and Health Sciences Hiroshima University Hiroshima Japan
2. Center for Oral Clinical Examination Hiroshima University Hospital Hiroshima Japan
3. Department of General Dentistry Hiroshima University Hospital Hiroshima Japan
4. Department of Periodontal Medicine, Graduate School of Biomedical and Health Sciences Hiroshima University Hiroshima Japan
5. Department of Oral and Maxillofacial Pathobiology, Graduate School of Biomedical and Health Sciences Hiroshima University Hiroshima Japan
6. Department of Bacteriology, Graduate School of Biomedical and Health Sciences Hiroshima University Hiroshima Japan