Panneerselvam P, K. Y, Prakash S, Sritharan M, Elanchezhian M. A retrospective cohort study on optimal serum progesterone levels before FET cycles using vaginal and parenteral progesterone supplementation and its pregnancy outcomes. Int J Reprod Contracept Obstet Gynecol [Internet]. 2025 Jul. 29 [cited 2025 Oct. 26];14(8):2544-51. Available from: https://www.ijrcog.org/index.php/ijrcog/article/view/15575