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Receiver operating characteristic (ROC) curve and the area under curve (AUC) of ROC curves in the training cohort with positive HBsAg (A, N = 412), validation cohort with positive HBsAg (B, N = 146), training cohort with negative HBsAg (C, N = 108) and validation cohort with negative HBsAg (D, N = 48).
