title: An even clearer portrait of bias in observational studies?
authors.affiliation: From the aMedical Research Council Integrative Epidemiology Unit, University of Bristol, Bristol, United Kingdom; and bSchool of Social and Community Medicine, University of Bristol, Bristol, United Kingdom.
authors.forename: Neil M
authors.initials: NM
authors.lastname: Davies
mesh_terms: D015982:Bias; D015986:Confounding Factors, Epidemiologic; D006801:Humans; D013223:Statistics as Topic