1. Shandong Provincial Qianfoshan Hospital, Shandong University, Jinan, China;
2. Department of Cardiography, Yantai Affiliated Hospital of Binzhou Medical University, Yantai, China;
3. Department of Ultrasonography, Shandong Provincial Qianfoshan Hospital, Shandong University, Jinan,China;
4. Department of Radiology, Shandong Provincial Qianfoshan Hospital, Shandong University, Jinan, China;
5. Medical Research Center, Shandong Provincial Qianfoshan Hospital, Shandong University, Jinan, China