Human tissue lead (Pb) levels and amyotrophic lateral sclerosis: a systematic review and meta-analysis of case-control studies.

Neurol Sci · 2022 · PMC9474539 · PMID 35809130

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a positive trendno p-value reported

For all tissues analyzed, we observed a positive trend that shows an association between the concentrations of Pb and the presence of the disease.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.