Titlebook: Epidemiology; Key to Prevention Klaus Krickeberg,Van Trong Pham,Thi My Hanh Pham Book 20121st edition Springer Science+Business Media, LLC

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Das Russisch-Sibirische Reisewerkbeen .=9,850 such patients, and for every one of them a medical record in the form of a file exists where the presence or absence of A is recorded. Dr. Q. could look through the whole (dust covered) set of files and count the occurrence of A in it. Suppose that he finds it 271 times; this would be the “frequency” he is looking for.

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Clinical (Therapeutic) Trials,rested in the influence of factors that make the risk of disease, death etc. . when their own level increases. Hence as explained in Sect. 2.3 the main application of analytic epidemiology is prevention by lowering the level of risk factors. We might call this “hygiene” in a very broad and modern sense.

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