Experience with polyethylene ring: 1955-1965. 2.
D004717:Endometrium / Q000473:pathology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007434:Intrauterine Devices / Q000009:adverse effects; D008595:Menorrhagia / Q000209:etiology; D009757:Nylons; D011095:Polyethylenes; D014592:Uterine Hemorrhage / Q000209:etiology
D009757:Nylons; D011095:Polyethylenes