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The direct correlation between serum calcium and serum FGF23 at Months 1 (a, n:31), 6 (b, n:25) and 12 (c, n:15) was evaluated according plasma phosphorus, at a cut-off level of 6 mg/dL. It could be observed that the significant association was mantained in patients with a plasma phosphorus <6 mg/dL, but it was consistently lost in patients with phosphemia >6 mg/dL.
