Left ventricular strain is abnormal in preclinical and overt hypertrophic cardiomyopathy: Cardiac MR feature tracking por Vigneault, DM, Yang, E, Jensen, PJ, Tee, MW, Farhad, H, Chu, L, Noble, JA, Day, SM, Colan, SD, Russell, MW, Towbin, J, Sherrid, MV, Canter, CE, Shi, L, Ho, CY, Bluemke, DA