Determination of left ventricular ejection fraction by visual estimation during real-time two-dimensional echocardiography
The American heart journal, 1982-09, Vol.104 (3), p.603-606 [Peer Reviewed Journal]1982 ;ISSN: 0002-8703 ;EISSN: 1097-6744 ;DOI: 10.1016/0002-8703(82)90233-2 ;PMID: 7113901
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