Chen Xuchang1, Han Weimin3, Wang Huimin2, Wu Yueming1, Su Maolong2
1The School of Clinical Medicine, Fujian Medical University, Fuzhou 350100, China; 2Department of Ultrasonography, Xiamen Cardiovascular Hospital, Xiamen University, Xiamen 361009, China; 3 School of Medicine, Xiamen University, Xiamen 361005, China;