Fig. 2From: Gonadotropin-releasing hormone antagonist versus progestin for the prevention of premature luteinising hormone surges in poor responders undergoing in vitro fertilisation treatment: study protocol for a randomised controlled trialSPIRIT diagram for this protocol comparing PPOS with GnRH antagonist in poor responders. GnRH gonadotrophin-releasing hormone, PPOS progestin-primed ovarian stimulationBack to article page