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Morphologic features of the normal and abnormal mitral valve. <i>Am J Cardiol<\/i> 1983; 51: 1005\u20131028.","DOI":"10.1016\/S0002-9149(83)80181-7"},{"key":"8","doi-asserted-by":"crossref","unstructured":"8. Levine RA, Handschumacher MD, Sanfilippo AJ, Hagege AA, Harrigan P, Marshall JE, et al. Three-dimensional echocardiographic reconstruction of the mitral valve, with implications for the diagnosis of mitral valve prolapse. <i>Circulation<\/i> 1989; 80: 589\u2013598.","DOI":"10.1161\/01.CIR.80.3.589"},{"key":"9","doi-asserted-by":"crossref","unstructured":"9. Nakatani S, Akaishi M, Asanuma T, Hashimoto S, Izumi C, Iwanaga S, et al. Guidelines from the Japanese Society of Echocardiography: Guidance for the management and maintenance of echocardiography equipment. <i>J Echocardiogr<\/i> 2015; 13: 1\u20135.","DOI":"10.1007\/s12574-015-0240-x"},{"key":"10","doi-asserted-by":"crossref","unstructured":"10. Ormiston JA, Shah PM, Tei C, Wong M. 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Levine RA, Stathogiannis E, Newell JB, Harrigan P, Weyman AE. Reconsideration of echocardiographic standards for mitral valve prolapse: Lack of association between leaflet displacement isolated to the apical four chamber view and independent echocardiographic evidence of abnormality. <i>J Am Coll Cardiol<\/i> 1988; 11: 1010\u20131019.","DOI":"10.1016\/S0735-1097(98)90059-6"},{"key":"14","doi-asserted-by":"crossref","unstructured":"14. Zoghbi WA, Enriquez-Sarano M, Foster E, Grayburn PA, Kraft CD, Levine RA, et al. Recommendations for evaluation of the severity of native valvular regurgitation with two-dimensional and Doppler echocardiography. <i>J Am Soc Echocardiogr<\/i> 2003; 16: 777\u2013802.","DOI":"10.1016\/S0894-7317(03)00335-3"},{"key":"15","doi-asserted-by":"crossref","unstructured":"15. Santas E, Chorro FJ, Minana G, Mendez J, Munoz J, Escribano D, et al. 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De Bonis M, Lapenna E, Maisano F, Barili F, La Canna G, Buzzatti N, et al. Long-term results (&lt;=18 years) of the edge-to-edge mitral valve repair without annuloplasty in degenerative mitral regurgitation: Implications for the percutaneous approach. <i>Circulation<\/i> 2014; 130: S19\u2013S24.","DOI":"10.1161\/CIRCULATIONAHA.113.007885"},{"key":"19","unstructured":"19. Morrel WG, Ge L, Zhang Z, Grossi EA, Guccione JM, Ratcliffe MB. Effect of mitral annuloplasty device shape and size on leaflet and myofiber stress following repair of posterior leaflet prolapse: A patient-specific finite element simulation. <i>J Heart Valve Dis<\/i> 2014; 23: 727\u2013734."},{"key":"20","doi-asserted-by":"crossref","unstructured":"20. Grayburn PA, Foster E, Sangli C, Weissman NJ, Massaro J, Glower DG, et al. Relationship between the magnitude of reduction in mitral regurgitation severity and left ventricular and left atrial reverse remodeling after mitraclip therapy. <i>Circulation<\/i> 2013; 128: 1667\u20131674.","DOI":"10.1161\/CIRCULATIONAHA.112.001039"},{"key":"21","doi-asserted-by":"crossref","unstructured":"21. Grasso C, Capodanno D, Tamburino C, Ohno Y. Current status and clinical development of transcatheter approaches for severe mitral regurgitation. <i>Circ J<\/i> 2015; 79: 1164\u20131171.","DOI":"10.1253\/circj.CJ-15-0447"},{"key":"22","doi-asserted-by":"crossref","unstructured":"22. Sutton TM, Stewart RA, Gerber IL, West TM, Richards AM, Yandle TG, et al. Plasma natriuretic peptide levels increase with symptoms and severity of mitral regurgitation. <i>J Am Coll Cardiol<\/i> 2003; 41: 2280\u20132287.","DOI":"10.1016\/S0735-1097(03)00486-8"},{"key":"23","doi-asserted-by":"crossref","unstructured":"23. 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