Alternative estimates of ectopic pregnancy risks during contraception.
Sivin
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D003270:Contraceptive Agents / Q000009:adverse effects*; D005260:Female; D006801:Humans; D007434:Intrauterine Devices / Q000009:adverse effects*; D011247:Pregnancy; D011271:Pregnancy, Ectopic / Q000453:epidemiology*; D012307:Risk Factors; D014481:United States
D003270:Contraceptive Agents