title: A clinical study on the mode of action of I.U.D.
mesh_terms: D000328:Adult; D004717:Endometrium / Q000473:pathology; D004967:Estrogens / Q000378:metabolism; D005260:Female; D006801:Humans; D007434:Intrauterine Devices / Q000009:adverse effects*; D008599:Menstruation Disturbances / Q000209:etiology*; D014626:Vaginal Smears
chemical_list: D004967:Estrogens