title: Effect of age on pelvic inflammatory disease in nulliparous women using a copper 7 intrauterine contraceptive device.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D005260:Female; D006801:Humans; D007435:Intrauterine Devices, Copper / Q000009:adverse effects*; D008875:Middle Aged; D010298:Parity; D000292:Pelvic Inflammatory Disease / Q000209:etiology*