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Validation of XGBoost models from external database. A ROC curve for the 6-month prognostic model (external validation data); B ROC curve for the 1-year prognostic model (external validation data); C ROC curve for the 2-year prognostic model (external validation data); D ROC curve for the 3-year prognostic model (external validation data); ROC receiver operating characteristic curve; AUC area under the curve; XGBoost extreme gradient boosting
