IUDs and ectopic pregnancy.
D000293:Adolescent; D000328:Adult; D002140:California; D005260:Female; D006801:Humans; D007434:Intrauterine Devices / Q000009:adverse effects*; D008875:Middle Aged; D011247:Pregnancy; D011271:Pregnancy, Ectopic / Q000150:complications / Q000453:epidemiology / Q000209:etiology*; D013548:Sweden; D006113:United Kingdom; D014481:United States