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Effect of different H2 inhalation frequencies and durations on nasal allergic symptoms. Mice were exposed to the H2 mixture for 0.5, 1 or 2 h each time, once or twice a day. The effects on (A) sneezing and (B) scratching. Data are presented as the mean ± standard error of the mean. *P<0.05 vs. the AR group. H2, hydrogen gas; He, helium gas; AR, allergic rhinitis.
