title: Clinical observations with Rigevidon.
mesh_terms: D003276:Contraceptives, Oral / Q000494:pharmacology*; D003277:Contraceptives, Oral, Combined / Q000494:pharmacology*; D004997:Ethinyl Estradiol / Q000008:administration & dosage / Q000494:pharmacology*; D005260:Female; D006801:Humans; D009644:Norgestrel / Q000008:administration & dosage / Q000494:pharmacology*; D010865:Pilot Projects; D011247:Pregnancy
chemical_list: D003276:Contraceptives, Oral; D003277:Contraceptives, Oral, Combined; D009644:Norgestrel; D004997:Ethinyl Estradiol