Emergency Department;
Beijing Anzhen Hospital;
Beijing 100029;
China Emergency Department;
Beijing Anzhen Hospital;
Beijing 100029;
China Public Health and Family Medicine Department;
Capital Medical University;
Beijing 100069;
China Emergency Department;
Beijing Anzhen Hospital;
Beijing 100029;
China Emergency Department;
Beijing Anzhen Hospital;
Beijing 100029;
China;
acute; myocardial; infarction; emergency; medical; service; risk; factor; prehospital; delay; time;