At the time of the earlier review, the most prominent question under study was whether there were substantial health effects at doses below those that produce symptoms. That question , once a focus of considerable controversy, has been effectively settled by a substantial group of newer studies. The newer data on lead's effects have revised the threshold for effect downward.
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Needleman et al. (1991) studied this question.
Synapse has enriched 2 closely related papers on similar clinical questions. Consider them for comparative context: