Zhengbing Liu1, Lili Hou1, Yu Liu2, Jianbin Gong3. 1. Department of Cardiology, Jinling Hospital, Nanjing University School of Medicine, Nanjing 210002, China. 2. Department of Cardiology, Affiliated Drum Tower Hospital, Nanjing University School of Medicine, Nanjing 210008, China. 3. Department of Cardiology, Jinling Hospital, Nanjing University School of Medicine, Nanjing 210002, China. Electronic address: jianbingong@163.com.