1. Department of Oral and Maxillofacial Surgery, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China
2. Department of Emergency Intensive Care Unit, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China
3. Department of Orthodontics, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China