title: Oral contraceptive study omitted several confounders.
authors.affiliation: Concord Hospital, Sydney, Australia samuelzagarella@gmail.com.
authors.forename: Samuel S
authors.initials: SS
authors.lastname: Zagarella
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