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Relationship between concentrations of EFZ in plasma (a readily accessible and more easily measured parameter) and concentrations of EFZ and 8OH-EFZ in CSF. CSF and plasma EFZ concentrations were correlated in the TBM group (a) and the no-TBM group (b). No relationship was seen for 8OH-EFZ in either the TBM group (c) or the no-TBM group (d). NS, not significant.
