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Circulation 2012; 125: 1643-51.","DOI":"10.1161\/CIRCULATIONAHA.111.055111"},{"key":"14","doi-asserted-by":"publisher","unstructured":"14. Otsuji Y, Handschumacher MD, Schwammenthal E, <i>et al<\/i>. Insights from three-dimensional echocardiography into the mechanism of functional mitral regurgitation: direct in vivo demonstration of altered leaflet tethering geometry. Circulation 1997; 96: 1999-2008.","DOI":"10.1161\/01.CIR.96.6.1999"},{"key":"15","doi-asserted-by":"crossref","unstructured":"15. Otani K, Takeuchi M, Kaku K, <i>et al<\/i>. Evidence of a vicious cycle in mitral regurgitation with prolapse: secondary tethering attributed to primary prolapse demonstrated by three-dimensional echocardiography exacerbates regurgitation. Circulation 2012; 126 (Suppl 1): S214-21.","DOI":"10.1161\/CIRCULATIONAHA.111.084178"},{"key":"16","doi-asserted-by":"crossref","unstructured":"16. Fukuda S, Song JK, Mahara K, <i>et al<\/i>. 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