1. Department of Oral and Maxillofacial Surgery, The affiliated Hospital of Qingdao University, Qingdao, Shandong, China
2. Department of Dental Digital Medicine and 3D Printing Engineering Laboratory, Qingdao University, Qingdao, Shandong, China
3. Department of Thyroid Surgery, The affiliated Hospital of Qingdao University, Qingdao, Shandong, China