title: Effective interception with the levonorgestrel-20-IUD contrarily to WHO advocated Lng-2-microdose IUD.
mesh_terms: D005260:Female; D006801:Humans; D007436:Intrauterine Devices, Medicated; D016912:Levonorgestrel; D009644:Norgestrel / Q000008:administration & dosage*; D011247:Pregnancy; D014944:World Health Organization
chemical_list: D009644:Norgestrel; D016912:Levonorgestrel