Cumulative ongoing pregnancy rate achieved with oocyte vitrification and cleavage stage transfer without embryo selection in a standard infertility program.

Although a negative trend was observed in the overall clinical outcomes when embryos derived from vitrified oocytes were transferred, the fresh and vitrified transfer groups cannot be compared in this study since the former group included all patients although the latter group included only those who did not become pregnant after the fresh transfer cycle.

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