The measurement of serum cystatin C was performed using the Quantikine® human cystatin C immunoassay (R&D Systems, Minneapolis, MN, USA). From the cystatin C measurements, eGFR values were calculated using the following equation: eGFR = 70.69 × (cystatin C)−0.931, where cystatin C is in mg/L [32 (link)].
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