Khtan A, Hussien YA. Protective effect of sildenafil in pulmonary hypertensive child with congenital heart disease. J. Contemp. Med. Sci. [Internet]. 2018 Dec. 26 [cited 2024 Nov. 24];4(4):211-5. Available from: https://jocms.org/index.php/jcms/article/view/487