CST3 and acute kidney injury: New biomarkers, such as neutrophil gelatinase-associated lipocalin (NGAL), cystatin C (Cys C), kidney injury molecule-1 (KIM-1), interleukin-18 (IL-18) and liver-type fatty acid binding protein (L-FABP), seem to be more efficient in detecting AKI before the rise in serum creatinine.