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Review: the levonorgestrel releasing intrauterine system prevents more pregnancies than intrauterine devices (IUDs) ≤250 mm2 but not IUDs >250 mm2

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  • Source of funding: NHS R&D Health Technology Assessment Programme.

  • For correspondence: Dr R French, Department of Sexually Transmitted Diseases, Royal Free and University College Medical School, Mortimer Market Centre, off Capper Street, London WC1E 6AU, UK. Fax + 44 (0)207 679 9669.