1. Department of Periodontology, Matsumoto Dental University, Shiojiri, Japan
2. Division of Community Oral Health Science, Department of Oral Health Promotion, Kyushu Dental University, Kitakyushu, Japan
3. Department of Oral Microbiology, Matsumoto Dental University, Shiojiri, Japan
4. Institute of Oral Science, Matsumoto Dental University, Shiojiri, Japan
5. Department of Preventive and Public Health Dentistry, Fukuoka Dental College, Fukuoka, Japan
6. Department of Pediatric Dentistry, School of Dentistry, Meikai University, Saitama, Japan
7. Department of Pediatric Dentistry, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan