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Schwerzmann, M.; Wustmann, K.; Zimmerli, M.; Seiler, C. (2001). Accurate determination of mitral regurgitation by assessing its influence on the combined diastolic mitral and pulmonary venous flow: just 'looking twice'. European journal of echocardiography, 2(4), pp. 277-284. Oxford University Press 10.1053/euje.2001.0103
