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The correlations between serum levels of irisin (A), adropin (B), preptin (C), BDNF (D) and PHQ-9 scores in CHD patients comorbid with depression. *, P<0.05, **, P<0.01, ***, P<0.001 between groups. CHD, coronary heart disease; BDNF, brain-derived neurotrophic factor.
