1. Department of Oral and Maxillofacial Surgery, Binzhou Medical University Hospital, Binzhou, Shandong 256600, P.R. China
2. Department of Stomatology, Jiaxing Hospital of Traditional Chinese Medicine, Jiaxing, Zhejiang 314001, P.R. China
3. Department of Stomatology, Zibo Central Hospital, Zibo, Shandong 255000, P.R. China
4. Medical Research Center, Binzhou Medical University Hospital, Binzhou, Shandong 256600, P.R. China