PIK3C2A and persistent fetal circulation syndrome: B: unstandardized regression coefficient; SE: standard error; Wald: Wald chi-square test statistic; Exp(B): odds ratio; CI: confidence interval; AKI: acute kidney injury; PPHN: persistent pulmonary hypertension; CPK-MB: creatine phosphokinase-MB; HIE: hypoxic ischemic encephalopathy.