Affiliation: | 1. Department of Oral and Maxillofacial Surgery, Affiliated Hospital of Qingdao University, Qingdao, Shandong, China;2. Department of Oral and Maxillofacial Surgery, Stomatology Hospital of Xi'an Jiaotong University College of Medicine, Xi'an, Shaanxi, China;3. Department of Stomatology, Xi'an, Shaanxi, China |