1. Department of Stomatology, Yantai Yuhuangding Hospital of Qingdao University, Yantai, Shandong 264000, P.R. China
2. Department of Clinical Laboratory, Yantai Yuhuangding Hospital of Qingdao University, Yantai, Shandong 264000, P.R. China
3. Department of Pathology, Yantai Yuhuangding Hospital of Qingdao University, Yantai, Shandong 264000, P.R. China
4. Department of Emergency, Yantai Yuhuangding Hospital of Qingdao University, Yantai, Shandong 264000, P.R. China