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Effect of a forest bathing trip on the number of granulysin-, perforin-, and granzymes A/B-expressing cells in peripheral blood lymphocytes (PBLs). Data are presented as the mean ± SD (n = 12). *P < 0.05, **P < 0.01, significantly different from before the trip, #P < 0.05 significantly different from day 1 by the paired t test. Cited from Li et al. [2]
