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(A–C): Linearity of the calibration curve in DBS. Based on 7 standard values, linearity is shown for each biomarker by comparing the spiked concentrations with the effectively measured concentrations. Concentration units are expressed in ng/mL (or 10−6 g/L). The * stands for the x in the regression equation, see Table 1. (A) Bland–Altman curve for GlcSph. (B) Bland–Altman curve for Lyso-Gb3. (C) Bland–Altman curve for Lyso-SM.
