title: Pill use before or during pregnancy does not raise risk of birth defects.
authors.forename: Richard
authors.initials: R
authors.lastname: Ma
mesh_terms: D000014:Abnormalities, Drug-Induced / Q000453:epidemiology* / Q000209:etiology; D000328:Adult; D015331:Cohort Studies; D003276:Contraceptives, Oral / Q000008:administration & dosage / Q000009:adverse effects*; D003718:Denmark / Q000453:epidemiology; D005260:Female; D006801:Humans; D011247:Pregnancy; D012042:Registries / Q000706:statistics & numerical data*; D012306:Risk
chemical_list: D003276:Contraceptives, Oral