title: [A retrospective epidemiological investigation of the contraceptive efficacy of IUDS].
authors.forename: M Q
authors.initials: MQ
authors.lastname: Qu
mesh_terms: D001208:Asia; D002681:China; D003267:Contraception; D003906:Developing Countries; D005193:Family Planning Services; D005202:Asia, Eastern; D007434:Intrauterine Devices
keywords: Asia; China; Contraception; Contraceptive Methods; Developing Countries; Eastern Asia; Family Planning; Iud; Iud, Unmedicated