Comparative efficacy of low-dose versus high-dose inhaled nitric oxide in extreme preterm infants with hypoxic respiratory failure: A retrospective cohort study - Alsayed Ali, Hamdy; Alturk, Mohamad Rami; Abumhara, Salah; Alkhzzam, Fadi (Acta Biomedica Atenei Parmensis, 2025)