title: Effectiveness of levonorgestrel given after or before ovulation.
authors.forename: Patricio
authors.initials: P
authors.lastname: Ventura-Juncá
authors.forename: Mauricio
authors.initials: M
authors.lastname: Besio
authors.forename: Manuel
authors.initials: M
authors.lastname: Santos
mesh_terms: D000284:Administration, Oral; D003280:Contraceptives, Oral, Synthetic / Q000008:administration & dosage*; D003281:Contraceptives, Postcoital / Q000008:administration & dosage*; D004334:Drug Administration Schedule; D005260:Female; D006801:Humans; D016912:Levonorgestrel / Q000008:administration & dosage*; D010060:Ovulation / Q000187:drug effects*; D010865:Pilot Projects; D011247:Pregnancy; D018873:Pregnancy Rate; D016896:Treatment Outcome
chemical_list: D003280:Contraceptives, Oral, Synthetic; D003281:Contraceptives, Postcoital; D016912:Levonorgestrel