Linkai Deng1, Yubin Cao2, Jie Lin3. 1. Department of Oral and Maxillofacial Surgery, The Second Affiliated Hospital of Guizhou Medical Hospital, Kaili, China. 2. Department of Head and Neck Oncology, State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, No. 14, Section Three, Ren Min Nan Road, Chengdu 610041, China. Electronic address: yubin.cao@qq.com. 3. Department of Dental Anesthesiology, State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, No. 14, Section Three, Ren Min Nan Road, Chengdu 610041, China. Electronic address: 13558852310@163.com.