1. Department of Oral and Maxillofacial Surgery, The Affiliated Zhongshan Hospital, Sun Yat-sen University, Zhongshan,Guangdong 528403, P.R. China
2. Department of Oral and Maxillofacial Surgery, The Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai, Guangdong 519000, P.R. China
3. Department of Medical Intensive Care Unit, The Affiliated Zhongshan Hospital, Sun Yat-sen University, Zhongshan, Guangdong 528403, P.R. China
4. Department of Oral and Maxillofacial Surgery, Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong 510055, P.R. China