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To assess the effect of the duration of uterine preparation with E2 on pregnancy rates (PRs) in oocyte donation.A retrospective study.IVF-ET Unit, oocyte donation program.Four hundred eleven patients undergoing 865 ET cycles after oocyte donation. Uterine preparation consisted of 6mg/d E2 valerate. The duration of treatment varied according to the availability of the oocytes for donation. Progesterone,...