1. The Affiliated Hospital of Stomatology; Chongqing Medical University; Chongqing; 401147; PR China
2. Department of Oral & Maxillofacial Surgery; West China Hospital of Stomatology, Sichuan University; Chengdu; 610041; PR China
3. State Key Laboratory of Oral Diseases; West China Hospital of Stomatology, Sichuan University; Chengdu; 610044; PR China