S. Elameen, A. Salem, A. Abdelgawad, A. El shemy, S. Taha, and I. Abdelsalam, “Prevalence of Coronary Artery Lesion(S) in Pati ents Aged 40-50 Years Undergoing Rheumatic Valvular Surgery”, ESJ, vol. 14, no. 6, p. 363, Feb. 2018.