title: Identical twinning and oral contraception.
authors.forename: A E
authors.initials: AE
authors.lastname: Emery
mesh_terms: D001695:Biology; D003267:Contraception; D003270:Contraceptive Agents; D003271:Contraceptive Agents, Female; D003276:Contraceptives, Oral; D019049:Developed Countries; D004739:England; D005060:Europe; D005193:Family Planning Services; D005823:Genetics; D005828:Genetics, Population; D011247:Pregnancy; D011256:Pregnancy Outcome; D012606:Scotland; D006113:United Kingdom; D014852:Wales
chemical_list: D003270:Contraceptive Agents; D003271:Contraceptive Agents, Female; D003276:Contraceptives, Oral
keywords: Biology; Contraception; Contraceptive Agents; Contraceptive Agents, Female; Contraceptive Methods; Developed Countries; England; Europe; Family Planning; Genetics; Genetics, Population; Northern Europe; Oral Contraceptives; Pregnancy; Pregnancy Outcomes; Scotland; United Kingdom; Wales