Oocyte, embryo and blastocyst cryopreservation in ART: systematic review and meta-analysis comparing slow-freezing versus vitrification to produce evidence for the development of global guidance.

Rienzi L, Gracia C, Maggiulli R, LaBarbera AR, Kaser DJ,  Ubaldi FM, Vanderpoel S, Racowsky C
Hum Reprod Update. 2017 Mar 1;23(2):139-155. doi: 10.1093/humupd/dmw038. . 2017 doi: