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Novel echocardiographic approach to the accurate measurement of pulmonary vascular resistance based on a theoretical formula in patients with left heart failure: Pilot study. <i>Circ J<\/i> 2015; 79: 2408\u20132413.","DOI":"10.1253\/circj.CJ-15-0575"},{"key":"26","doi-asserted-by":"crossref","unstructured":"26. Su J, Hughes AD, Simonsen U, Nielsen-Kudsk JE, Parker KH, Howard LS, et al. 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