Ahmed, I. et al. 2022. Comparison of Left Ventricular Ejection Fraction in Heart Failure Patients on Echocardiography, Cardiac Magnetic Resonance Imaging and Single Photon Emission Computed Tomography. Pakistan Armed Forces Medical Journal. 72, SUPPL-3 (Nov. 2022), S461–66. DOI:https://doi.org/10.51253/pafmj.v72iSUPPL-3.9534.