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The clinical syndrome of asthma has been known for more than 2000 years, but much about the complex two-way interactions between the immune system and airway epithelium, the effect of the environment, and the underlying pathophysiology of the disorder remains obscure. For reasons that are not entirely clear, the prevalence of asthma has increased in the past decade; not only is the burden of the disease increasing, but morbidity and mortality from asthma have also increased in many parts of the world. Most patients with asthma have mild disease, but some patients have severe asthma that profoundly affects the quality
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