FABP1 and acute kidney injury: Unlike the TRIBE-AKI study, the Follow-Up Renal Assessment of Injury Long-Term After Acute Kidney Injury (FRAIL-AKI) study demonstrated that 7–8 years after cardiac surgery, children with AKI had higher urinary IL-18, kidney injury molecule-1 (KIM-1), and liver-type fatty acid-binding protein (L-FABP) concentrations (24).