1. Department of Oral and Maxillofacial Surgery, Zhengzhou Central Hospital Affiliated to Zhengzhou University, Zhengzhou, Henan, China
2. Department of Stomatology, Dezhou People’s Hospital, Dezhou, Shandong, China
3. Department of Oral and Maxillofacial Surgery, Dezhou People’s Hospital, Dezhou, Shandong, China