GNRH1 and endometriosis: Furthermore, the fertilization rate is often overlooked, and it hasrecently been shown that fertilization rate positively correlates with cumulativelive birth rate (LBR).10 In this systematic review, we aim to compare ART outcomes following the longGnRH-agonist COS protocol with the GnRH-antagonist COS protocol specifically forwomen with endometriosis.