Benjamin, B. “Evaluation of Correlation Between Myocardial Performance Index and Left Ventricular Ejection Fraction in Patients With Acute ST-Elevation Myocardial Infarction”. International Journal of Research in Medical Sciences, vol. 6, no. 12, Nov. 2018, pp. 3908-15, doi:10.18203/2320-6012.ijrms20184881.