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Kaplan–Meier curves for survival (in-hospital) by referral class during the first 20 days of hospitalization. Patients discharged alive were censored. Log-rank statistic, P < 0.001. erHA-AKI, early-referred hospital-acquired acute kidney injury; nrHA-AKI, hospital-acquired acute kidney injury without nephrology referral; lrHA-AKI, late-referred HA-AKI.
