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Receiver operating characteristic curve of HU for predicting postoperative recurrence. The optimal cut-off value for HU was 20 with the sensitivity of 0.692 and a specificity of 0.733 (AUC: 0.667, 95% CI (0.455-0.878)). ROC, receiver operating characteristic; HU, Hounsfield unit; AUC, area under the curve.
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