[Epidemiologic study on ectopic pregnancy associated with IUD].
D000328:Adult; D002681:China; D005260:Female; D006801:Humans; D007434:Intrauterine Devices / Q000009:adverse effects*; D011247:Pregnancy; D011271:Pregnancy, Ectopic / Q000453:epidemiology*; D011274:Pregnancy, Tubal / Q000453:epidemiology; D012189:Retrospective Studies