Siddique, R., T. Haque, M. Kabiruzzaman, S. R. Chowdhury, F. T. N. Malik, and M. A. Rahman. “Early Impairment of Left Ventricular Function in Hypertensive Patients With Preserved Ejection Fraction Using Tissue Doppler Echocardiography”. Cardiovascular Journal, vol. 9, no. 2, May 2017, pp. 147-54, doi:10.3329/cardio.v9i2.32428.