Abbreviations: weeks of gestation (WoG); day of hospitalization (DoH); Continuous Positive Airway Pressure (CPAP); Positive end-expiratory pressure (PEEP); postinfectious bronchiolitis obliterans (PIBO); respiratory syncytial virus (RSV); body mass index (BMI); alanine aminotransferase (ALT); acute lymphoblastic leukemia (ALL); atrioventricular valve regurgitation (AVVR); pro–brain natriuretic peptide (BNP); aspartate aminotransferase (AST). This evidence concerns the gene NPPB and bronchiolitis obliterans syndrome.