Department of Cardiology;
the First Medical Center of Chinese PLA General Hospital;
Beijing;
China;
The School of Medicine;
Nankai University;
Tianjin;
China;
Department of Cardiology;
the First People's Hospital of Yunlin;
Guangxi;
China;
Department of Cardiology;
Beijing Chaoyang Hospital;
Capital Medical University;
Beijing;
China;
Department of Cardiology;
Wuhan Asia Heart Hospital;
Wuhan;
China;
Department of Cardiology;
Hainan Hospital of PLA General Hospital;
Hainan;
China;
Department of Cardiology;
Affiliated Hospital of Zunyi Medical College;
Guizhou;
China;
Department of Cardiology;
Guizhou Provincial People's Hospital;
Guizhou;
China;
Department of Cardiology;
the Second Hospital of Hebei Medical University;
Hebei;
China;
Department of Cardiology;
the Second Affiliated Hospital of Nanchang University;
Jiangxi;
China;
Cardiovascular disease; Myocardial infarct size; Nicorandil; Primary percutaneous coronary intervention; ST-segment elevation myocardial infarction;