title: Emergency contraception with levonorgestrel or the Yuzpe regimen. Task Force on Postovulatory Methods of Fertility Regulation.
authors.forename: H
authors.initials: H
authors.lastname: von Hertzen
authors.forename: G
authors.initials: G
authors.lastname: Piaggio
authors.forename: P F
authors.initials: PF
authors.lastname: Van Look
mesh_terms: D003283:Contraceptives, Postcoital, Synthetic; D005260:Female; D006801:Humans; D016912:Levonorgestrel; D013997:Time Factors
chemical_list: D003283:Contraceptives, Postcoital, Synthetic; D016912:Levonorgestrel