title: Observational studies in radiology.
authors.affiliation: Department of Radiology, Harborview Medical Center and Harborview Injury Prevention and Research Center, University of Washington, Box 359728, 325 Ninth Ave., Seattle, WA 98104, USA.
authors.forename: C Craig
authors.initials: CC
authors.lastname: Blackmore
authors.forename: Peter
authors.initials: P
authors.lastname: Cummings
mesh_terms: D035843:Biomedical Research; D016022:Case-Control Studies; D015984:Causality; D015331:Cohort Studies; D015986:Confounding Factors, Epidemiologic; D016017:Odds Ratio; D011871:Radiology; D016032:Randomized Controlled Trials as Topic; D015983:Selection Bias