Asthma is a chronic inflammatory disease of the airways. In recent years, both asthma prevalence and incidence have been increasing worldwide. This is not only due to the genetic background but also effect of a wide number of environmental and lifestyle risk factors. Asthma affects about 334 million people worldwide1 . It is estimated that there may be an additional 100 million people with asthma by 2025. Asthma accounts for about 1 in every 250 deaths worldwide. Treatment of underlying airways inflammation is crucial for asthma management.

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