1. State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
2. Department of Periodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
3. Department of Pediatric Dentistry, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
4. Department of Stomatology, The Third Hospital of Peking University, Beijing 100191, China
5. Chinese Academy of Medical Sciences Research Unit of Oral Carcinogenesis and Management, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
6. Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
7. Center for Craniofacial Molecular Biology, Herman Ostrow School of Dentistry, University of Southern California, Los Angeles, CA 90033, USA
8. Clinical Skills Training Center, West China Hospital, Sichuan University, Chengdu, Sichuan, China