Occurrence of ectopic pregnancy in women with IUD's and consideration of the contraceptive mechanism of the IUD.
D005260:Female; D006801:Humans; D007434:Intrauterine Devices / Q000009:adverse effects*; D011247:Pregnancy; D011271:Pregnancy, Ectopic / Q000453:epidemiology / Q000209:etiology*; D013624:Taiwan