Fresh versus Frozen Embryos for Infertility in the Polycysti
The transfer of fresh embryos is generally preferred over the transfer of frozen embryos for in vitro fertilization (IVF), but some evidence suggests that frozen-embryo transfer may improve the live-birth rate and lower the rates of the ovarian hyperstimulation syndrome and pregnancy complications in women with the polycystic ovary syndrome...

http://www.nejm.org/doi/full/10.1056/NEJMoa1513873
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