In chronic respiratory disease, bronchial asthma is a common in all ages and different ethnic groups of diseases. Asthma is characterized by chronic airway inflammation, airway responsiveness to a variety of stimuli, a wide variety of reversible airflow limitation and airway remodeling following the course of the disease. Incidence and mortality rate increased year by year, and the incidence of asthma in different populations was between 1% and 18%.Because of the repeated attacks, it is difficult to cure an...
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