Triggering with human chorionic gonadotropin or a gonadotropin-releasing hormone agonist in gonadotropin-releasing hormone antagonist-treated oocyte donor cycles: findings of a large retrospective cohort study - Bodri, D; Guillén, J J; Galindo, A; Mataró, D; Pujol, A; Coll, O (Fertil Steril, 2009)