
Keywords: BPD; Bronchopulmonary dysplasia; CP; Cerebral palsy; EPO; Erythropoietin; IVH; Intraventricular hemorrhage; NICU; Neonatal intensive care; OI; Oxygen index; OUH; Oulu University Hospital; PDA; Patent ductus arteriosus; PVL; Periventricular leukomalacia; R