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Mangal, S. and Mehirishi, S. 2017. 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. International Journal of Reproduction, Contraception, Obstetrics and Gynecology. 5, 7 (Feb. 2017), 2274–2277. DOI:https://doi.org/10.18203/2320-1770.ijrcog20162109.