title: The association between the amount of copper on copper carrying IUDs and their contraceptive efficacy.
mesh_terms: D003300:Copper / Q000032:analysis*; D004305:Dose-Response Relationship, Drug; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D007434:Intrauterine Devices; D011247:Pregnancy
chemical_list: D003300:Copper