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Epidemiology : A Very Short Introduction
Health is everybody's natural concern, and an everyday theme in the media. Outbreaks of disease such as the most recent influenza, occuring in many countries at he same time, make front-page news. Beyond epidemics, novel findings on dangeraous pollutants in the environment, substances in food which prevent cancer, genes presdisposing to disease or drugs promising to wipe them out, are reported regularly. Their actual relevance for human health depends crucially on the accumulation of evidence from studies, guided by the principles of epidemiology, that directly observe and evaluate what happens in human populations and groups. rn<br> rn<br> rnThese studies combine two features. They explore health and disease with the instruments of medical research, ranging from records of medical histories to measures of height, weight, blood pressure to a wide variety of diagnostics tests and procedures.
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