Toenails as biomarker of exposure to essential trace metals: A review.

Environ Res · 2019 · PMC8164381 · PMID 31610392

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might be significantno p-value reported

Isolated reports have suggested that Zn levels might be higher in winter ( Campos et al., 2008 ) and that there might be significant differences in metal toenail levels depending on the season of sampling collection, for Cu, but not for Zn ( Wilhelm et al., 1991 ) or Se ( Baskett et al., 1995 ).

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