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Overall survival curves according to the duration of acute kidney injury in each KDIGO stage: stage 1 (A), stage 2 (B), and stage 3 (C). Duration of acute kidney injury: 1st tertile, 1–2 days; 2nd tertile, 3–5 days; 3rd tertile, ≥ 6 days. RRT, patients who underwent renal replacement therapy.
