title: Long-acting, more effective copper T IUDs: a summary of U.S. experience, 1970-75.
mesh_terms: D000293:Adolescent; D000328:Adult; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D007433:Intrauterine Device Expulsion; D007435:Intrauterine Devices, Copper / Q000009:adverse effects / Q000706:statistics & numerical data; D000292:Pelvic Inflammatory Disease / Q000453:epidemiology; D011247:Pregnancy; D011271:Pregnancy, Ectopic / Q000453:epidemiology; D014481:United States; D002583:Uterine Cervical Neoplasms / Q000453:epidemiology; D002575:Uterine Cervicitis / Q000453:epidemiology; D014627:Vaginitis / Q000453:epidemiology