title: Oral contraceptives and prevention of implantation.
authors.forename: J
authors.initials: J
authors.lastname: Klein
mesh_terms: D003281:Contraceptives, Postcoital / Q000494:pharmacology*; D010064:Embryo Implantation / Q000187:drug effects*; D004992:Ethics, Medical; D005260:Female; D006801:Humans; D007258:Informed Consent
chemical_list: D003281:Contraceptives, Postcoital