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Model discrimination via 0·632 bootstrap Receiver operating characteristic (ROC) curves for a elastic net regression (area under the curve (AUC) 0·791, 95 per cent c.i. 0·757 to 0·826), b random forest (AUC 0·801, 0·769 to 0·834), c XG boost (AUC 0·804, 0·772 to 0·836) and d ensemble (AUC 0·805, 0·790 to 0·819). The shaded area represents the 95 per cent confidence interval.
