1. School of Stomatology of Qingdao University, Qingdao, China
2. Department of Oral and Maxillofacial Surgery, The Affiliated Yantai Yuhuangding Hospital of Qingdao University, Yantai, China
3. Department of Pharmacy, The First Affiliated Hospital of Xi 'an Jiaotong University, Chang'an District Hospital, Xi 'an, China