“…Given that the vitrification technique has improved the efficiency and outcome of oocyte or embryo cryopreservation programmes (Kolibianakis et al, 2009), some investigators recommended a 'freeze all' policy for all IVF patients (Barnhart, 2014;Shapiro et al, 2014aShapiro et al, , 2014bWeinerman and Mainigi, 2014). This concept has also been suggested after GnRHa trigger in view of concerns about the abnormal luteal phase (Atkinson et al, 2014;Devroey et al, 2011;Garcia-Velasco, 2012;Griesinger et al, 2010Griesinger et al, , 2011aGriesinger et al, , 2011bHerrero et al, 2011;Manzanares et al, 2010). It is, therefore, essential that a highly successful oocyte and embryo cryopreservation programme is in place in all centres for this approach to be successful and widely accepted.…”