1. Department of Pathology, Binzhou Medical University, Yantai, Shandong 264003, P.R. China
2. Department of Radiology, Yantai Affiliated Hospital of Binzhou Medical University, Yantai, Shandong 264100, P.R. China
3. Medical Imaging Research Institute, Binzhou Medical University, Yantai, Shandong 264003, P.R. China