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Public health interventions are implemented without attempt to prospectively them with an experimental design. Thus the only to evaluate the outcome of intervention is to describe happened before and after implementation. In a new study in PLoS Medicine, Morgan al. have examined the change in attributed to paracetamol (acetaminophen) poisoning in and Wales in the six years and after a legislated reduction the maximum pack size [1].
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Buckley et al. (2007) studied this question.
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