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Southern Medical Journal|May 1, 1991
Clinical utility of transesophageal echocardiographyR E Safford, J L Blackshear, E J Kapples
Journal of the American Society of Echocardiography : Official Publication of the American Society of Echocardiography|July 1, 1992
Beat-by-beat aortic valve area measurements indicate constant orifice area in aortic stenosis: analysis of Doppler data with varying RR intervalsJ L Blackshear, E J Kapples, G E Lane, et al.
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