1. State Key Laboratory of Oral Diseases; National Clinical Research Center for Oral Diseases; Department of Orthodontics; West China Hospital of Stomatology; Sichuan University; Chengdu 610041 China
2. Department of Surgery; University of Pittsburgh; Pittsburgh PA 15213 USA
3. State Key Laboratory of Trauma; Burns and Combined Injury; Second Department of Research Institute of Surgery; Daping Hospital; Third Military Medical University; Chongqing 400042 China
4. Department of Emergency; Union Hospital; Tongji Medical College; Hua Zhong University of Science and Technology; Wuhan 430022 China
5. Department of Anesthesia; Shanghai East Hospital; Tongji University; Shanghai 200120 China