1. Department of Pediatric DentistryKagoshima University Graduate School of Medical and Dental Sciences Kagoshima Japan
2. Department of Oral MicrobiologyKagoshima University Graduate School of Medical and Dental Sciences Kagoshima Japan
3. Department of BacteriologyHiroshima University Graduate School of Biomedical and Health Sciences Hiroshima Japan
4. Department of Public Oral Health, Program of Oral Health SciencesHiroshima University Graduate School of Biomedical and Health Sciences Hiroshima Japan