7Gross NJ. Chronic obstructive pulmonary disease:an evidence-based approach to treatment with a focus on anticholinergic bronchodilation. Mayo Clin Proc,2008,83 ( 11 ) : 1241 - 1250.
8Larsen MV, Janner JH, Nielsen SD, et al. Bacteriology in acute exacerbation of chronic obstructive pulmonary disease in patients admitted to hospital. Stand J Infect Dis,2009 ,41 (1) :26 -32.
9Ko FW,Ip M,Chan PK,Ng SS,et al. A 1-year prospeetive study of the infectious etiology in patients hospitalized with acute exacerbations of COPD and concomitant pneumonia. Respir Med,2008,102 (8) :1109 -1116.
