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Serum concentrations of biologically important POPs or their metabolites were measured in subsamples of the NHANES 1999 2002 (NCHS 2005).
Serum concentrations of various biologically important POPs or their metabolites were measured in subsamples of the NHANES 1999 2002 surveys (NCHS 2005).
Third, because concentrations of POPs tend to be highly correlated in the general population, any POP that is strongly correlated with other biologically important POPs may come out statistically significant in epidemiological studies.
Therefore, in the presence of low-dose effects of POPs, the contamination of the reference group of specific POPs with higher concentrations of other important POPs may lead to an artificial increase of risk within the reference group of the specific POP, leading to underestimated risk relative to this group.
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