GNRH1 and endometriosis: Four studies included the number of MII oocytes retrieved15, –17,19 (seeTable 6).Pabuccu et al. were the only study to analyse patients withstage I–II endometriosis and found no difference between the two protocols.In severe stages of endometriosis, Ruggiero et al.17 reported a significantly higher number of MII oocytes retrieved whenthe GnRH-antagonist protocol was used.