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Evaluation of Subclinical Systolic Dysfunction in Patients with Heart Failure with Preserved Ejection Fraction, Using 2D Speckle Tracking Echocardiography. Univ. Heart J. [Internet]. 2025 Jan. 8 [cited 2026 Jul. 1];20(1):3-9. Available from: https://www.banglajol.info/index.php/UHJ/article/view/78462