PCB-containing wood floor finish is a likely source of elevated PCBs in residents' blood, household air and dust: a case study of exposure.

Environ Health · 2008 · PMC2267460 · PMID 18201376

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may be significantno p-value reported

In addition, potential exposure to floor sanders may be significant and studies to evaluate blood PCB concentrations among this group are needed.

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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.