Percentage of Single Photon Emission Computed Tomography (SPECT), Positron Emission Tomography (PET) Myocardial Perfusion Imaging (MPI), transthoracic echocardiography, or stress echocardiography imaging studies where the Left Ventricle Ejection Fraction (LVEF) was calculated and included in the report performed on patients 18 years of age or older.