1. Department of Cardiology, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, Guangdong 510080, P.R. China
2. Intensive Care Unit, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong 510260, P.R. China
3. Department of Cardiology, Laiwu City People's Hospital, Laiwu, Shandong 27110, P.R. China
4. Department of Cardiology, Sun Yat-Sen Cardiovascular Hospital, Shenzhen, Guangdong 518020, P.R. China