CCL22 and asthma: The levels of interferon‐γ (IFN‐γ), tumor necrosis factor‐a (TNF‐α), chemokine CCL22 (CCL22), interleukin 12 (IL‐12), chemokine CCL4 (CCL4), chemokine CCL2 (CCL2), and chemokine CCL13 (CCL13)were significantly higher in the acute asthma group than in the stable asthma group.