Acute Kidney Injury 1 Article 1 Cohort Studies 1 Ductus Arteriosus, Patent ICD-10 1 Indomethacin 1 Infant 1 Renal Insufficiency 1 acute kidney failure 1 amikacin 1 aminoglycoside 1 amphotericin B 1 aortic root 1 apnea 1 artificial ventilation 1 birth weight 1 brain hemorrhage 1 cohort analysis 1 corticosteroid 1 creatinine blood level 1 dexamethasone 1 disease severity 1 dobutamine 1 dopamine 1 echocardiography 1 epinephrine 1 extremely low birth weight 1 female 1 furosemide 1 gentamicin 1