GNRH1 and endometriosis: The other RCT treated pain associated with deep rectovaginal endometriosis with the aromatase inhibitor letrozole (2.5 mg/day) and then randomized the patients to also receive norethisterone (2.5 mg/day) or the GnRH agonist triptorelin (11.25 mg every 3 months) for 6 months.2