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Epidemiology, as a
public health discipline, prides itself in using scientific principles in
studying health problems. Since the world is not a big laboratory, public
health practitioners cannot conduct scientific experiments as researchers
can, and would, in a laboratory. Public health practitioners use what is
available first, and then collect whatever additional data they need through
mostly observational studies. Fortunately, there are many good sources of
information available - if you know where to look.
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