1 Department of Cardiology, Affiliated Nan Hai hospital of Southern Medical University, Foshan 528200, China.
2 Department of Cardiology, the Third Affiliated hospital, Sun Yat-sen University, Guangzhou 510080, China.
3 Department of Cardiology, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China.
4 Department of Cardiology, the Third Affiliated hospital, Sun Yat-sen University, Guangzhou 510080, China. Electronic address: liujl@mail.sysu.edu.cn.
5 Department of Cardiology, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China. Electronic address: zhxd2@mail2.sysu.edu.cn.