Letter: Ectopic pregnancy and the intrauterine contraceptive device.
D004717:Endometrium / Q000473:pathology; D005260:Female; D006801:Humans; D007434:Intrauterine Devices / Q000009:adverse effects*; D011247:Pregnancy; D011271:Pregnancy, Ectopic / Q000453:epidemiology / Q000209:etiology*