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Results of ammonia-induced cough in Glycyrrhiza uralensis Fisch. flavonoids from 21 producing areas. The result represents mean ± S.D. Note. Compared with the normal group, ##P < 0.01 is a very significant difference. Compared with the model group, ∗P < 0.05 was considered to be significant; ∗∗P < 0.01, and there was a significant difference (n = 10).
