title: Confounding in epidemiological studies: why "independent" effects may not be all they seem.
authors.affiliation: Department of Public Health, University of Glasgow.
authors.forename: G D
authors.initials: GD
authors.lastname: Smith
authors.forename: A N
authors.initials: AN
authors.lastname: Phillips
mesh_terms: D015986:Confounding Factors, Epidemiologic; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans