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Sample selection process for a propensity-matched study of patients receiving fluid replacement on the day of surgery with or without 6% HES 130/0.4 to determine any associations between HES and the incidence of acute kidney injury. *Multiple exclusion criteria were applied because some patients met 2 or more exclusion criteria. CKD indicates chronic kidney disease; HES, hydroxyethyl starch; PS, propensity score.
