1. Department of Pediatric Dentistry Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences Okayama Japan
2. Department of Pediatric Dentistry Osaka University Graduate School of Dentistry Suita‐Osaka Japan
3. Department of Oral Microbiology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences and the Advanced Research Center for Oral and Craniofacial Sciences, Dental School Okayama University Okayama Japan
4. Department of Pharmacology, School of Veterinary Medicine Azabu University Sagamihara Japan