title: Pitfalls of pharmacoepidemiology.
authors.forename: R
authors.initials: R
authors.lastname: Farmer
authors.forename: T
authors.initials: T
authors.lastname: Williams
authors.forename: A
authors.initials: A
authors.lastname: Nightingale
mesh_terms: D000293:Adolescent; D000328:Adult; D016907:Adverse Drug Reaction Reporting Systems; D003276:Contraceptives, Oral / Q000009:adverse effects*; D005260:Female; D006801:Humans; D008875:Middle Aged; D013923:Thromboembolism / Q000139:chemically induced*
chemical_list: D003276:Contraceptives, Oral