1. Department of Oral and Maxillofacial Surgery, School of Stomatology, State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Clinical Research Center for Oral Diseases, The Fourth Military Medical University, Xi'an, China
2. Department of Oral and Maxillofacial Surgery, School of Stomatology, Xi'an Medical University, Xi'an, China