Preliminary data.The incidence of lung disease chronic barrier (Chronic obstructive pulmonary disease, COPD) refers to a group of diseases and symptoms in the respiratory system barrier to block the lower part from the changes of the bronchi or windpipe, lungs, until the meat Browning down narrow or contracted tonnes.Narrow or contracted feature tons of the bronchi, chronic cannot return normally, the disease in this group include bronchitis, chronic lung disease, airbags inflate and Pong. Symptoms of the disease, which has similar characteristics.
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