title: Failing in analysis of the performance of the gynefix 200 intrauterine system.
authors.forename: Irving
authors.initials: I
authors.lastname: Sivin
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D007435:Intrauterine Devices, Copper / Q000009:adverse effects; D008875:Middle Aged; D011247:Pregnancy