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Receiver operating characteristic (ROC) curve of day 1 serum and urine neutrophil gelatinase‐associated lipocalin (NGAL) levels for prediction of acute kidney injury (AKI) (after excluding those who had AKI on day 1). (
) Serum NGAL day 1; (
) urine NGAL day 1; (
) reference line. AUC, area under the receiver operating curve.
