5Fishman AP, Elisa JA, Fishman SA, et al. Fishman's Pul- monary Diseases and Disorders[M]. 4thed. McGraw-Hill Company, 2008 : 361-457.
6Diaz A,Barria P, Niederman M, et al. Etiology of commu- nity-acquired pneumonia in hospitalized patients in Chile: the increasing prevalence of respiratory viruses among classic pathogens[J]. Chest, 2007,131 (3) : 779-787.