The effectiveness of the Copper-T intrauterine device: a collaborative study in five countries.
D000328:Adult; D000367:Age Factors; D003105:Colombia; D003300:Copper; D005069:Evaluation Studies as Topic; D005191:Family Characteristics; D005193:Family Planning Services; D005260:Female; D006801:Humans; D007434:Intrauterine Devices / Q000592:standards*; D007492:Iran; D007723:Korea; D011247:Pregnancy; D012494:Sampling Studies; D013223:Statistics as Topic; D013624:Taiwan; D013785:Thailand
D003300:Copper