taj al deen, Wisam , s., et al. “Coronary Angiogriphy in Left Ventricular Dysfunction Patients With No Clinical Evidence of Ischemic Heart Disease”. AL-Kindy College Medical Journal, vol. 9, no. 1, Jan. 2013, pp. 133-7, https://jkmc.uobaghdad.edu.iq/index.php/MEDICAL/article/view/564.