1. State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, P. R. China
2. Department of Emergency, West China Hospital, Sichuan University, 610041 Chengdu, China
3. College of Biomedical Engineering, Sichuan University, Chengdu 610041, China