You Yang1, Yunzhao Hu2. 1. Department of Cardiology, Shunde Hospital, Southern Medical University (the First People's Hospital of Shunde), Foshan 528000, Guangdong, China. 2. Department of Cardiology, Shunde Hospital, Southern Medical University (the First People's Hospital of Shunde), Foshan 528000, Guangdong, China. Electronic address: huyunzhao4406@163.com.