
Keywords: طب پیشگیری; extreme prematurity; indomethacin; prophylaxis; bronchopulmonary dysplasia; BPD; Bronchopulmonary dysplasia; GDB; Generic Database; NRN; Neonatal Research Network; PDA; Patent ductus arteriosus; PMA; Postmenstrual age; RCTs; Randomized controlled trials;