Plasma Neutrophil Gelatinase-Associated Lipocalin and Interleukin-9 as Acute Kidney Injury Predictors After Coronary Artery Bypass Graft Following Cardiopulmonary Bypass Ghuraba Adisurya, Kun Arifi Abbas*, Nancy Margarita Rehatta and Hardiono Abstract Background: Acute Kidney Injury (AKI) incidence of postoperative Coronary Artery Bypass Graft (CABG) with Cardipulmonary Bypass (CPB) at Dr. Soetomo