Jun Tan1,2,3, Lihua Zhou4, Yang Zhou5, Peng Xue1,2, Guangsheng Wu1,2,6, Guangying Dong1,2, Hang Guo7, Qintao Wang1,2. 1. State Key Laboratory of Military Stomatology, Department of Periodontology, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, P.R.China. 2. Shaanxi Key Laboratory of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, P.R.China. 3. Department of Stomatology, Guangzhou General Hospital of Guangzhou Military Command, Guangzhou, Guangdong, P.R.China. 4. Department of Stomatology, General Hospital of Beijing Military Area, Beijing, P.R.China. 5. Department of Anesthesiology, Guangzhou General Hospital of Guangzhou Military Command, Guangzhou, Guangdong, P.R.China. 6. Department of Stomatology, Qingdao First Sanatorium of Jinan Military Area Command, Qingdao, Shandong, P.R.China. 7. Department of Anesthesiology, General Hospital of Beijing Military Area, Beijing, P.R.China.