1. introductionThe incidence of chronic lung disease, perhaps As a public health problem of major countries around the world, because it is a major cause of illness and death. From the evaluation of the World Health Organization in 2001, the incidence of chronic lung disease, perhaps caused the death rate at 5 in countries with a high income and a leading cause of death in 6 countries that ranked low income and moderate, and the problem is expected to be higher due to the aging population worldwide, there are more. (Lopez AD, Mathers CD, Ezzati M, et al ,2006 )
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