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Primary preventive measures have to be taken first because they are
cheaper and more effective. They act on risk factors, which are numerous
and entangled. In developed populations, many risk factors were automatically
controlled by the same process of social, educational, and economical
development. i.e.: Extreme maternal ages were reduced by family planning.
Maternal illnesses were reduced by effective immunologic protection of the
whole population and other actions of health promotion. Drug sales were
controlled by reinforced rules as well as by public education.
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