Domínguez-Rodríguez, Alberto Acute coronary syndrome - always a difficult diagnosis in emergencies: the rule of 9. [electronic resource] - Emergencias : revista de la Sociedad Espanola de Medicina de Emergencias 02 2020 - 3-4 p. digital Publication Type: Editorial ISSN: 2386-5857 Subjects--Topical Terms: Acute Coronary Syndrome--diagnosisChest PainEmergenciesHumansMyocardial Infarction