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Receiver operating characteristic (ROC) curves of the training set and the validation set. (A) The nomogram had an area under curve (AUC) of 0.640 [95% confidence interval (CI): 0.607 to 0.673] in the training set. (B) The nomogram had an AUC of 0.644 (95% CI: 0.595 to 0.693) in the validation set.
