The occurrence of pregnancy dispite the presence of Lippes' loop: a report of two cases.
D000022:Abortion, Spontaneous / Q000209:etiology; D000328:Adult; D005260:Female; D006801:Humans; D007434:Intrauterine Devices / Q000009:adverse effects*; D007744:Obstetric Labor Complications; D011247:Pregnancy; D014599:Uterus / Q000002:abnormalities