title: Comparative cervical cytology in women using different types of copper IUDs.
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007435:Intrauterine Devices, Copper / Q000009:adverse effects*; D008875:Middle Aged; D013997:Time Factors; D002578:Uterine Cervical Dysplasia / Q000209:etiology; D014626:Vaginal Smears