title: Why do the results of randomised and observational studies differ?
authors: Jan P
authors: JP
authors: Vandenbroucke
mesh_terms: D015415:Biomarkers; D002318:Cardiovascular Diseases / Q000175:diagnosis*; D016021:Epidemiologic Studies; D006801:Humans; D019370:Observation; D016032:Randomized Controlled Trials as Topic
chemical_list: D015415:Biomarkers