Ali, Syed Mahmud, et al. “Role of Left Atrial Strain Using Two-Dimensional Speckle Tracking Echocardiography for Early Detection of Left Ventricular Diastolic Dysfunction in Patients With Preserved Left Ventricular Ejection Fraction”. Cardiology and Cardiovascular Medicine, vol. 9, no. 1, Feb. 2025, pp. 57-64, http://www.fortunejournals.org/ojs/index.php/ccm/article/view/16569.