Studies which investigate potential risks to health posed by chemicals vary in design, methodological quality, populations studied, and exposure and health outcomes considered. Even very large, highly-cited studies will be challenged or refuted over time, which is why decision-making (if it is to be based on the best available evidence) requires on-going reconciliation of studies which give different answers to the same question.

To read more about how research should be aggregated if risk assessment is to be scientifically robust, click here.

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