Research Article
Quantitative Measurement of Plasma Free Metanephrines by a Simple and Cost-Effective Microextraction Packed Sorbent with Porous Graphitic Carbon and Liquid Chromatography-Tandem Mass Spectrometry
Figure 4
Dot, box, and whisker plots illustrating the concentrations of plasma free metanephrines in clinical specimens. Dotted lines represent the upper cutoff values.
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