IRCT20120215009014N308 IRCT 2019-10-13 Hamedan University of Medical Sciences The pregnancy success rate after frozen embryo transfer with and without intrauterine injection of HCG-activated peripheral blood mononuclear cells in infertile women The pregnancy success rate after frozen embryo transfer with and without intrauterine injection of HCG-activated peripheral blood mononuclear cells in infertile women: a single-blind randomized clinical trial 2019-10-23 anticipated 92 Complete https://irct.ir/trial/42604 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: The patients will be randomly assigned to intervention and control groups using block randomization. For this purpose, we will prepare four sheets of paper, writing on two sheets the name of the intervention and on the other two sheets the name of the control. The paper sheets will be pooled, placed in a container, and randomly drawn one at a time for each patient without replacement until all four sheets are drawn. The four paper sheets will be then placed back into the container, and this action repeated until the sample size is reached, Blinding description: The patients will be unaware of the type of intervention. Thus, the trial will be run as single-blind. N/A Female infertility. Intervention 1: Intervention group: Transfer of frozen embryos plus an intrauterine injection of 20 ml centrifuged and activated HCG from 20 ml peripheral blood. Intervention 2: Control group: Transfer of frozen embryos alone. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is It depends on the situations and the results of the study as well as approval of the financial supporting organization.