1. Department of Oral and Maxillofacial Surgery, State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology (Sichuan University), Chengdu, Sichuan 610041, P.R. China
2. Department of Stomatology, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan 610072, P.R. China
3. Department of Oral Pathology, State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology (Sichuan University), Chengdu, Sichuan 610041, P.R. China