Time periods for renal recovery based on various study endpoints in the published literature. AKD, acute kidney disease []; AKI, acute kidney injury; CKD, chronic kidney disease; eGFR, estimated glomerular filtration rate; RIFLE-E, end-stage of of Risk, Injury, Failure, Loss, End-stage kidney disease criteria []; RIFLE-R, loss stage of Risk, Injury, Failure, Loss, End-stage kidney disease criteria; RRT, renal replacement therapy.