1. Department of Cardiology, Affiliated Zhongshan Hospital of Guangdong Medical University, Zhongshan, Guangdong 528415, P.R. China
2. Department of Cardiology, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong 510120, P.R. China
3. Department of General Surgery, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong 510120, P.R. China