Fig. 2

a Bland-Altman plot of the differences (Y-axis) and means (X-axis) of the logarithmic transformed values obtained from Modified EMIT and LC-MS/MS measurements (n = 79). b. Bland-Altman plot of the differences (Y-axis) and means (X-axis) of the logarithmic transformed values obtained from Modified EMIT and Commercial EMIT measurements (n = 45)