title: Missed contraceptive pills and the critical pill-free interval.
authors.affiliation: Newcastle Primary Care Trust, Newcastle upon Tyne NE4 6BE, UK. diana.mansour@newcastle-pct.nhs.uk
authors.forename: Diana
authors.initials: D
authors.lastname: Mansour
authors.forename: Ian S
authors.initials: IS
authors.lastname: Fraser
mesh_terms: D003278:Contraceptives, Oral, Hormonal / Q000008:administration & dosage*; D004334:Drug Administration Schedule; D004997:Ethinyl Estradiol / Q000008:administration & dosage; D005260:Female; D017408:Guidelines as Topic; D006801:Humans; D010349:Patient Compliance; D010353:Patient Education as Topic; D011247:Pregnancy; D049168:Pregnancy, Unplanned
chemical_list: D003278:Contraceptives, Oral, Hormonal; D004997:Ethinyl Estradiol