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. 2006 Aug 29;114(12):1843–1846. doi: 10.1289/ehp.9413

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Correlation analyses of total urinary concentrations of methyl and n-propyl parabens limited to samples with detectable levels of each paraben (n = 93; r = 0.92; p < 0.0001). Conc, concentration. When all samples were included in the analysis, the r- and p-values were very similar.