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Study flow chart. From January 2013 to January 2016, 41 590 continuous patients were registered in CAMI registry. Those aged <18 or >100 years (n=1178), with missing or invalid data on gender (n=18), admission diagnosis (n=1237) and detailed smoking status (n=1543) were excluded. The final cohort included 37 614 patients. CAMI, China acute myocardial infarction.
