Letter: Progesterone-releasing intrauterine contraceptive device.
D005260:Female; D006801:Humans; D007434:Intrauterine Devices; D007436:Intrauterine Devices, Medicated / Q000009:adverse effects; D010919:Placebos; D011247:Pregnancy; D011374:Progesterone; D014592:Uterine Hemorrhage / Q000209:etiology
D010919:Placebos; D011374:Progesterone