1. Department of Oral and Maxillofacial Surgery, Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat‑sen University, Guangzhou, Guangdong 510055, P.R. China
2. Department of Oral and Maxillofacial Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China