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Objective
To externally validate Yonsei nomogram.
Methods
From 2000 through 2018, 3526 consecutive patients underwent on‐clamp PN for cT1 renal masses at 23 centers were included. All patients had two kidneys, preoperative eGFR ≥60 ml/min/1.73 m2, and a minimum follow‐up of 12 months. New‐onset CKD was defined as upgrading from CKD stage I or II into CKD stage ≥III. We obtained the CKD‐free progression...
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