Abstract:Background: The number of frozen embryo transfer (FET) is increasing, however, an optimal protocol for FET is undetermined. Our study was to evaluate the letrozole use on the patients with normal menstrual cycles (MC) compared with HRT cycle and natural cycle. Methods: It is a large retrospective study involved 2932 patients. Inverse probability of treatment weighting (IPTW) approach aimed to equate each group with respect to measured baseline covariates to achieve a comparison with reduced selection bias. Pa… Show more
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