1. Division of Pediatric Dentistry, Graduate School of Medical and Dental Science Niigata University Niigata Japan
2. Department of Pediatric Dentistry Asahi University School of Dentistry Mizuho Japan
3. Department of Pediatric Dentistry Kagoshima University Graduate School of Medical and Dental Sciences Kagoshima Japan
4. Department of Dentistry for the Disability and Oral Health Asahi University School of Dentistry Gifu Japan
5. Department of Dental Hygiene Ogaki Women's College Ogaki Japan