title: Assessing effects of confounding variables.
mesh_terms: D003276:Contraceptives, Oral / Q000009:adverse effects; D004813:Epidemiology; D005260:Female; D006801:Humans; D009203:Myocardial Infarction / Q000453:epidemiology / Q000209:etiology; D011336:Probability; D012306:Risk; D012907:Smoking / Q000150:complications; D013223:Statistics as Topic
chemical_list: D003276:Contraceptives, Oral