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Overview of all individual elements of the health composite score for the summer and winter separately. (A) IFN-γ, (B) TNF-α, (C) cortisol 0.5 h before bedtime, and (D) RHR of the night after 2 and 4 weeks of PBM. Significance codes: ** p < 0.01, * p < 0.05, # p < 0.1 ns: not significant. Sample sizes per condition are shown.
