Variability in Ejection Fraction Measured By Echocardiography, Gated Single-Photon Emission Computed Tomography, and Cardiac Magnetic Resonance in Patients With Coronary Artery Disease and Left Ventricular DysfunctionPatricia A. Pellikka, Jae K. Oh, Kerry L. Lee et al.|JAMA Network Open|2018Cited by 228