1. The First Ward of Cardiovascular Medicine, YanTaiShan Hospital, Yantai, Shandong, China
2. Department of Emergency, The Affiliated Yantai Yuhuangding Hospital of Qingdao University, Yantai, Shandong, China
3. Department of Ultrasonic Medicine, The Affiliated Yantai Yuhuangding Hospital of Qingdao University, Yantai, Shandong, China