title: Assessing bias in case-control studies. Proper selection of cases and controls.
authors.affiliation: Department of Epidemiology, University of Pittsburgh, Pa 15261.
authors.forename: K
authors.initials: K
authors.lastname: Sutton-Tyrrell
mesh_terms: D016022:Case-Control Studies; D006760:Hospitalization; D006801:Humans; D015588:Observer Variation; D012017:Referral and Consultation