Fig. 4From: A new approach for urinary vanillylmandelic acid determination using eVol microextraction by packed sorbent coupled to liquid chromatography-tandem mass spectrometryComparison between the MEPS-LC-MS/MS and dilute-and-shoot LC-MS/MS assays. Upper plots: weighed Deming fits (solid black lines); lower plots: Bland-Altman analyses (solid black lines). The dotted red lines represent the 95% limit of agreementBack to article page