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Graphical representation of the randomized controlled trials that evaluated the outcomes of the systematic review. RCTs, randomized controlled trials; BPD, bronchopulmonary dysplasia; HG, hyperglycemia; NDV, neurodevelopment; §, at least one between patent ductus arteriosus, intraventricular hemorrhage, necrotizing enterocolitis (or gastrointestinal perforation) and retinopathy of prematurity.
