Low versus atmospheric oxygen tension for embryo culture in assisted reproduction: a systematic review and meta-analysis - Nastri, Carolina Oliveira; Nóbrega, Beatrice N.; Teixeira, Danielle M.; Amorim, Jowanka; Diniz, Livia M. M.; Barbosa, Marina W. P.; Giorgi, Vanessa S. I.; Pileggi, Vicky N.; Martins, Wellington de Paula (Fertility and Sterility, 2016)