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Flowchart of the patient selection process. Patients with evidence of endotracheal intubation were identified in the Medical Information Mart for Intensive Care IV database. After careful selection, patients were divided into 2 groups according to whether they had been successfully weaned from MV within 14 days of intubation or not. MV: mechanical ventilation; SAPS II: Simplified Acute Physiology Score II; SOFA: Sequential Organ Failure Assessment.
