1. State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, P. R. China
2. Department of Prosthodontics, Tianjin Medical University School of Stomatology, Tianjin 300070, P. R. China
3. West China Medical Center, Sichuan University, Chengdu 610041, P. R. China
4. Department of Oral and Maxillofacial Surgery, Hospital of Stomatology, Southwest Medical University, Luzhou 646000, P. R. China
5. College of Biomedical Engineering, Sichuan University, Chengdu 610041, P. R. China