Athwal A, Chakravorty R, Sur D, Saha R. Use of letrozole versus clomiphene citrate combined with gonadotropins for ovulation induction in infertile women with polycystic ovary syndrome: a pilot study. Int J Reprod Contracept Obstet Gynecol [Internet]. 2017 Aug. 28 [cited 2025 Oct. 2];6(9):4098-101. Available from: https://www.ijrcog.org/index.php/ijrcog/article/view/3371