title: Correspondence (letter to the editor): Alternatives.
authors.forename: Ludwig N
authors.initials: LN
authors.lastname: Baumgartner
mesh_terms: D003277:Contraceptives, Oral, Combined / Q000008:administration & dosage*; D003278:Contraceptives, Oral, Hormonal / Q000008:administration & dosage*; D005260:Female; D006801:Humans; D011247:Pregnancy
chemical_list: D003277:Contraceptives, Oral, Combined; D003278:Contraceptives, Oral, Hormonal