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(A) Flowchart of patient selection (n=1177). (B) Model development flowchart. ICD-9, 9th revision of the International Classification of Diseases; ICU, intensive care unit; LASSO, least absolute shrinkage and selection operator; MIMIC-III, Medical Information Mart for Intensive Care III; NT-proBNP, N-terminal pro-brain natriuretic peptide; XGBoost, extreme gradient boosting.
