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BMJ 2004;328:762 (27 March), doi:10.1136/bmj.328.7442.762-e
We failed to notice a missing level of evidence in the table accompanying this editorial by Ramachandran S Vasan (BMJ 2003;327:1181-2). The level of evidence for using imaging to determine the ejection fraction in order to diagnose systolic heart failure should have been shown as level I (evidence from several, large, well conducted randomised controlled trials).
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