GNRH1 and endometriosis: Globally, 581 (9 studies) women received, after surgery for endometriosis, dienogest and 345 other medical treatments, of which 281 (3 studies) were GnRH analogs (GnRHa), 64 (5 studies) were estroprogestins, and 742 (6 studies) were placebo or no therapy.