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Receiver operating characteristic curves for diagnosis of PPGLs (A) and HNPGLs (B). Curves are shown for combinations of normetanephrine and metanephrine (lower curve) vs normetanephrine, metanephrine and methoxytyramine (upper curve). A full color version of this figure is available at http://dx.doi.org/10.1530/EJE-17-0077.
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