linear correlations between serum hepcidin levels and serum ferritin concentrations. We used the serum ferritin level as X, and the serum hepcidin level as Y. Dots of the graph represent the detected concentration value. Lines of the graph represent the linear correlation between them (R2 = 0.790, P < 0.001). The equation is presented in Fig. 2 (Y = 0.46X + 93.14).