title: A comparative randomized double-blind study of the copper-T200 and copper-7 intrauterine contraceptive devices with modified insertion techniques.
mesh_terms: D000328:Adult; D002986:Clinical Trials as Topic; D003300:Copper; D005260:Female; D006801:Humans; D007434:Intrauterine Devices / Q000009:adverse effects*; D008722:Methods; D011247:Pregnancy
chemical_list: D003300:Copper