title: Authors' reply to Zagarella.
authors.affiliation: University of Nottingham, Nottingham, UK yana.vinogradova@nottingham.ac.uk.
authors.forename: Yana
authors.initials: Y
authors.lastname: Vinogradova
authors.affiliation: University of Nottingham, Nottingham, UK.
authors.forename: Carol
authors.initials: C
authors.lastname: Coupland
authors.affiliation: University of Nottingham, Nottingham, UK.
authors.forename: Julia
authors.initials: J
authors.lastname: Hippisley-Cox
mesh_terms: D003277:Contraceptives, Oral, Combined / Q000009:adverse effects*; D005260:Female; D006801:Humans; D010818:Practice Patterns, Physicians' / Q000706:statistics & numerical data*; D054556:Venous Thromboembolism / Q000453:epidemiology*
chemical_list: D003277:Contraceptives, Oral, Combined