title: Could secular trends account for infertility differences in IUDs?
authors.forename: J
authors.initials: J
authors.lastname: Lippes
authors.forename: G
authors.initials: G
authors.lastname: Grubb
mesh_terms: D001695:Biology; D003267:Contraception; D004194:Disease; D005069:Evaluation Studies as Topic; D005193:Family Planning Services; D007246:Infertility; D007434:Intrauterine Devices; D010827:Physiology; D012098:Reproduction; D012106:Research; D014566:Urogenital System
keywords: Biology; Contraception; Contraceptive Methods; Diseases; Evaluation; Evaluation Methodology; Family Planning; Infertility--etiology; Iud; Iud, Unmedicated; Physiology; Reproduction; Research Methodology; Urogenital Effects; Urogenital System