Mangal S, Mehirishi S. To study and compare the effect of vaginal sildenafil and estradiol valerate on endometrial thickness, blood flow and pregnancy rates in infertile women undergoing intrauterine insemination. Int J Reprod Contracept Obstet Gynecol [Internet]. 2017 Feb. 23 [cited 2025 Oct. 27];5(7):2274-7. Available from: https://www.ijrcog.org/index.php/ijrcog/article/view/1380