Long-term clinical and echocardiographic follow-up after surgical correction of hypertrophic obstructive cardiomyopathy with extended myectomy and reconstruction of the subvalvular mitral apparatus. - Schöndube,F.A.; Klues,H.G.; Reith,S.; Flachskampf,F.A.; Hanrath,P.; Messmer,B.J. (Circulation, 1995)