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The correlations between serum creatinine concentration (μmol/L), the ratio of serum creatinine level in 24 hours to creatinine level before MTX infusion (S-creatinine ratio), creatinine clearance rate (CCR, mL/min), and serum MTX concentration (μmol/L) in 3 g/m2 (unfilled circle) and 5 g/m2 groups (filled inverted triangle).
