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References related to Maternal hCG and fetal gender
Xiong F, Sun Q, Li GG, et al. Initial serum HCG levels are higher in pregnant women with a male fetus after fresh or frozen single blastocyst transfer: A retrospective cohort study. Taiwan J Obstet Gynecol. 2019,58(6):833-839. doi:10.1016/j.tjog.2019.09.019
Yaron Y, Lehavi O, Orr-Urtreger A, et al. Maternal serum HCG is higher in the presence of a female fetus as early as week 3 post-fertilization. Hum Reprod. 2002,17(2):485-489. doi:10.1093/humrep/17.2.485