Fig. 1From: Patent ductus arteriosus, systemic NT-proBNP concentrations and development of bronchopulmonary dysplasia in very preterm infants: retrospective data analysis from a randomized controlled trialFlow chart of study patients. BPD = bronchopulmonary dysplasia; NT-proBNP = N-terminal pro-brain natriuretic peptide; PDA = patent ductus arteriosusBack to article page