ICP-MS trace element analysis in serum and whole blood.

PLoS One · 2020 · PMC7239469 · PMID 32433650

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only marginally significantno p-value reported

Penny and Overgaard [ 30 ] found only marginally significant differences in the contamination of chromium between samples taken using stainless steel needles and plastic needles.

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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.