1. State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, National Clinical Research Center for Oral Diseases, Sichuan University, Chengdu, China
2. Department of Operative Dentistry and Endodontics, West China School of Stomatology, Sichuan University, Chengdu, China
3. Department of Oral Pathology, West China School of Stomatology, Sichuan University, Chengdu, China