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After the II World War, some North American and European countries entered in
the welfare state and investments in health care and education increased.
Consequently health interventions and related medical research grew up. At the
same time, variability in clinical practice (diagnosis, treatments, prevention
methods) and an under-use of research might be observed. The reasons were
ignorance of scientific advances and delay in its dissemination. Since 1960
medical research benefits from clinical epidemiology (clinical trials) and
biostatistics (meta analysis). Parallel, scientific publications grow up and
library sciences aided by computer sciences achieve an enormous progress.
Epidemiology, biostatistics and library sciences are essential tools for EBHC
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