1. Department of Clinical Medicine, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250012, P.R. China
2. Department of Clinical Medicine, Yanggu County Central Hospital, Liaocheng, Shandong 252300, P.R. China
3. Department of Plastic and Burn Surgery, Qilu Hospital of Shandong University, Jinan, Shandong 250012, P.R. China
4. Department of Oral and Maxillofacial Surgery, Qilu Hospital of Shandong University, Jinan, Shandong 250012, P.R. China