title: Methods to account for confounding in observational studies.
authors.affiliation: UCL Medical School, London, UK. c.smith@ucl.ac.uk
authors.forename: C J
authors.initials: CJ
authors.lastname: Smith
mesh_terms: D015986:Confounding Factors, Epidemiologic; D019370:Observation / Q000379:methods*; D012107:Research Design