title: Pregnancy rate after longer use of two copper IUDs.
mesh_terms: D003267:Contraception; D003268:Contraception Behavior; D003710:Demography; D003933:Diagnosis; D005193:Family Planning Services; D007434:Intrauterine Devices; D007435:Intrauterine Devices, Copper; D015993:Life Tables; D010342:Patient Acceptance of Health Care; D012106:Research; D012153:Retention, Psychology; D012725:Sexual Behavior
keywords: Acceptor Characteristics; Comparative Studies; Contraception; Contraception Failure; Contraceptive Methods; Contraceptive Usage; Demographic Analysis; Examinations And Diagnoses; Family Planning; Iud; Iud, Copper Releasing; Life Table Method; Research Methodology; Retention; Sex Behavior; Studies