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Variability of urinary methyl paraben (MEPB) and bisphenol A (BPA) concentrations [ng/mL] from longitudinal samples of 9 women, plotted versus the days since the first sample collection. First four or five samples were typically collected once a week during the 2nd trimester and the next four or five samples were typically collected once a week during the 3rd trimester. Circle points represent first morning voids (FMVs) and black diamond points represent 24-hour samples.
