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The proportion of early clopidogrel therapy stratified by region among patients with acute myocardial infarction. P<0.001 for changes between 2006 and 2011, P<0.001 for changes in all regions. Error bar indicates 95% CI. C/WU indicates Central/Western-urban; CR, Central-rural; ER, Eastern-rural; EU, Eastern-urban; WR, Western-rural.
