FGF23 and acute kidney injury: Similar to our findings regarding the predictive ability of preoperative FGF23 regarding the post-HMII/3 need for dialysis, Speer et al. [5] have also shown that FGF23 is a recognized biomarker for the advancement of CKD; notably, the aforementioned authors showed that FGF23 is strong predictor of AKI after elective cardiac surgery [5].