Department of Cardiology, Tianjin Chest Hospital, No. 261, Taierzhuang South Road, Jinnan District, Tianjin, 300222, China. Department of Cardiology, Tianjin Chest Hospital, No. 261, Taierzhuang South Road, Jinnan District, Tianjin, 300222, China. cdrfnk@163.com. Tianjin Medical University, Tianjin, China. Department of Cardiology, Teda International Cardiovascular Hospital, Tianjin, China. Department of Cardiology, Tianjin Fourth Central Hospital, Tianjin, China. Department of Cardiology, Tianjin First Central Hospital, Tianjin, China.