1. Dept. of Cardiology, Taizhou People’s hospital, Jiangsu Province, China
2. Dept. of Cardiology, Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Fudan University, Shanghai, China
3. Dept. of Echocardiography, Shanghai Institute of Cardiovascular Diseases, Shanghai Institute of Medical Imaging, Zhongshan Hospital, Fudan University, Shanghai, China.