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Relationship of serum levels of eHSP72 and CAF22 with hand-grip strength (HGS; A–C) and appendicular skeletal muscle mass (ASMI; D–F) at the baseline (A,D), 12 (B,E) and 24-month (C,F) time points in healthy controls and patients with COPD GOLD stages 1 and 2 and 3 and 4 (N = 64–68 participants/group/time point for pooled data).
