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Subjects’ serum intact FGF23 and C‐terminal FGF23 levels and intact FGF23:C‐terminal FGF23 ratios at the baseline and after 3 months’ sodium ferrous citrate treatment. The iFGF23 (pg/mL) and cFGF23 (pmol/L) measurements were obtained simultaneously, and the unit conversion of the cFGF23 data was performed using the following equation: 0.133 pmol/L = 1 pg/mL. The data are expressed as median values and interquartile ranges. *P < 0.05 compared with the baseline values.
