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Appearance of or persistence of severe mitral regurgitation without left ventricular outflow obstruction after partial ventricular septal myotomy-myectomy in hypertrophic cardiomyopathy. Am J Cardiol 1991; 68: 1726-8.","DOI":"10.1016\/0002-9149(91)90341-H"},{"key":"8","doi-asserted-by":"crossref","unstructured":"8) Sherrid MV, Chaudhry FA, Swistel DG. Obstructive hypertrophic cardiomyopathy: echocardiography, pathophysiology, and the continuing evolution of surgery for obstruction. Ann Thorac Surg 2003; 75: 620-32.","DOI":"10.1016\/S0003-4975(02)04546-0"},{"key":"9","doi-asserted-by":"crossref","unstructured":"9) Balaram SK, Tyrie L, Sherrid MV, et al. Resectionplication-release for hypertrophic cardiomyopathy: clinical and echocardiographic follow-up. 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