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Effect of LF-EMF stimulation on LF (A), HF (B) and LF/HF (C) in the Control group (n = 8) and EMF group (n = 8). *P < 0.05 and **P < 0.01 vs group baseline; #P < 0.05 and ##P < 0.05 as compared to the Control group. LF, low frequency; HF, high frequency; LF/HF, the ratio between LF and HF; BH, baseline. Other abbreviations are identical to those in Fig. 1.
