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Clin Sci (Lond) 94: 21-28, 1998."},{"key":"12","unstructured":"12. Fukuda N, Shinohara H, Sakabe K, Nada T, Tamura Y. Plasma levels of brain natriuretic peptide in various forms of obstruction to the left ventricular outflow tract. J Heart Valve Dis 12: 333-340, 2003."},{"key":"13","doi-asserted-by":"crossref","unstructured":"13. Hamada M, Ikeda S, Ohshima K, et al. Impact of chronic use of cibenzoline on left ventricular pressure gradient and left ventricular remodeling in patients with hypertrophic obstructive cardiomyopathy. J Cardiol 67: 279-286, 2016.","DOI":"10.1016\/j.jjcc.2015.05.014"},{"key":"14","doi-asserted-by":"crossref","unstructured":"14. Uematsu S, Takaghi A, Imamura Y, Ashihara K, Hagiwara N. Clinical features of the systolic anterior motion of the mitral valve among patients without hypertrophic cardiomyopathy. J Cardiol 69: 495-500, 2017.","DOI":"10.1016\/j.jjcc.2016.04.004"},{"key":"15","doi-asserted-by":"crossref","unstructured":"15. 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