A four-year report on loop D.
D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007434:Intrauterine Devices / Q000009:adverse effects; D000292:Pelvic Inflammatory Disease / Q000209:etiology; D011247:Pregnancy; D014592:Uterine Hemorrhage / Q000209:etiology; D014597:Uterine Rupture / Q000209:etiology