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Correlation between clinical data and serum concentration of GDF-15 and myostatin. A. Relationships between serum concentration of GDF-15, and (a) handgrip strength, (b) walking speed, (c) SMI, and (d) muscle thickness. B. Relationships between serum concentration of myostatin, and (a) handgrip strength, (b) walking speed, (c) SMI, and (d) muscle thickness. *, p < 0.05, **, p < 0.01, ***, p < 0.001.
