Department of Oral and Maxillofacial Surgery;
Children's Hospital;
Chongqing Medical University;
Chongqing 400014;
China;
Department of Research and Administration Services;
Qujing No.1 Hospital;
Qujing 655000;
China;
Department of Oral Surgery;
Dental Hospital;
Kunming Medical University;
Kunming 650031;
China;