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Single or multiple embryo transfer following in vitro fertilisation for improved neonatal outcome: A systematic review of the literature

Background:  The aim of the current review was to determine if single versus two or more embryos, or double versus three or more embryos, transferred to the woman of a subfertile couple at in vitro fertilisation (IVF) maximises the likelihood of pregnancy, while minimising the likelihood of multiple pregnancy and adverse sequelae.