1. Department of Oral and Maxillofacial Surgery, College of Stomatology, Hospital of Stomatology, Guangxi Medical University, Nanning, China
2. Guangxi Key Laboratory of Oral and Maxillofacial Rehabilitation and Reconstruction, Nanning, China
3. Guangxi Clinical Research Center for Craniofacial Deformity, Nanning, China
4. School of Public Health, Guangxi Medical University, Nanning, China.