EDN1 and pulmonary arterial hypertension: BV, biventricular; CDH, congenital diaphragmatic hernia; CI, confidence interval; ECMO, extracorporeal membrane oxygenation; ET-1, endothelin-1; FETO, fetal endoluminal tracheal occlusion; HR, hazard ratio; O/e LHR, observed-to-expected lung-to-head ratio; PH, pulmonary hypertension; SE, standard error