WHO study of the progesterone IUD.
D004311:Double-Blind Method; D005260:Female; D006801:Humans; D007436:Intrauterine Devices, Medicated / Q000592:standards*; D011247:Pregnancy; D011374:Progesterone / Q000008:administration & dosage; D012107:Research Design / Q000592:standards*; D014944:World Health Organization
D011374:Progesterone