1. Division of Pediatric Dentistry, Department of Oral Health and Development Sciences Tohoku University Graduate School of Dentistry Sendai Japan
2. State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Cariology and Endodontics West China Hospital of Stomatology, Sichuan University Chengdu China
3. Section of Pediatric Dentistry, Division of Oral Health, Growth and Development Faculty of Dental Science, Kyushu University Fukuoka Japan
4. Section of Orthodontics and Dentofacial Orthopedics, Division of Oral Health, Growth and Development Faculty of Dental Science, Kyushu University Fukuoka Japan
5. Department of Pediatric Dentistry Peking University School and Hospital of Stomatology Beijing China