Background
Edited by: Francesco Maria Fusi, Papa Giovanni XXIII Hospital, ItalyReviewed by: Bindu Menon, University of Toledo, United StatesLixia Zhu, Huazhong University of Science and Technology, China†ORCID: Na Li, Human chorionic gonadotropin (hCG) as one of the first signals secreted by the embryo to the mother may have a direct effect on the endometrium at implantation. The current study was aim to compare the clinical outcomes after frozen-thawed embryo transfer (FET) treated with artificial cycles (AC) between women who were administered intramuscular injection of human chorionic gonadotropin (hCG) as luteal phase support and the routine group.