1 Department of Oral and Maxillofacial Reconstruction, The Affiliated Hospital of Qingdao University, Qingdao, China; School of Stomatology of Qingdao University, Qingdao, China.
2 Department of Oral and Maxillofacial Reconstruction, The Affiliated Hospital of Qingdao University, Qingdao, China; Key Lab of Oral Clinical Medicine, The Affiliated Hospital of Qingdao University, Qingdao, China. Electronic address: herohao@163.com.
3 Department of Oral and Maxillofacial Reconstruction, The Affiliated Hospital of Qingdao University, Qingdao, China; Key Lab of Oral Clinical Medicine, The Affiliated Hospital of Qingdao University, Qingdao, China. Electronic address: zhikeqian@sina.com.