1. Department of Cardiac Surgery, Guangdong Cardiovascular Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University , Guangzhou 510080 , China
2. Department of Emergency, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University , Zhongshan 2nd Rd 106, Guangzhou 510080 , China
3. Department of Echocardiography, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University , Zhongshan 2nd Rd 106, Guangzhou 510080 , China
4. Department of Cardiac Surgery, Fuwai Hospital , Beijing 100037 , China