1. The Second School of Clinical Medicine, Binzhou Medical University, Yantai, Shandong 264100, P.R. China
2. Department of Pathology, Binzhou Medical University, College of Basic Medical Sciences, Yantai, Shandong 264003, P.R. China
3. School of Clinical Medicine, Shandong Second Medical University, Weifang, Shandong 261000, P.R. China
4. Department of Pathology, Affiliated Yantai Yuhuangding Hospital, Qingdao University, Yantai, Shandong 264000, P.R. China
5. Department of Pathology, Affiliated Yantai Yuhuangding Hospital, Qingdao University, Yantai, Shandong 264000, P.R. China