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Simple logistic regression of quantitative diagnostic tools. Receiver-operating characteristic curves showing the predictive power for diagnosis of either IE (a–e) of white blood cell count (WBC), C-reactive protein (CRP), procalcitonin (PCT), vegetation size and N-terminal prohormone of B-type natriuretic peptide (NT-proBNP) or 1-year mortality of NT-proBNP (f).
