Li, Rui-Rui Comparative study of pregnancy outcomes between day 3 embryo transfer and day 5 blastocyst transfer in patients with progesterone elevation. [electronic resource] - The Journal of international medical research Aug 2013 - 1318-25 p. digital Publication Type: Comparative Study; Journal Article ISSN: 1473-2300 Standard No.: 10.1177/0300060513489480 doi Subjects--Topical Terms: AdultBlastocyst--physiologyChorionic Gonadotropin--therapeutic useEmbryo Transfer--methodsFemaleFertilization in VitroHumansInfertility, Female--bloodPregnancyPregnancy OutcomePregnancy RatePregnancy, Ectopic--diagnostic imagingProgesterone--bloodRetrospective StudiesTime FactorsUltrasonography