1 Department of Pathology, Yantai Affiliated Hospital of Binzhou Medical University, Yantai, Shandong, China.
2 Department of Radiology, Yantai Affiliated Hospital of Binzhou Medical University, Yantai, Shandong, China.
3 Department of Radiology, Yantai Affiliated Hospital of Binzhou Medical University, Yantai, Shandong, China; Department of Radiology, Binzhou Medical University Hospital, Binzhou, Shandong, China. Electronic address: myxjk@sina.com.