2Singh S,Amin AV,Loke YK.Long-term use of inhaled corticosteroids and the risk of pneumonia in chronic obstructive pulmonary disease:a meta-analysis[J].Arch Intern Med,2009(169):219-229.
3Calverley PM,Stockley RA,Seemungal TA,et al.Reported pneumonia in patients with COPD:findings from the INSPIRE study[J].Chest,2011(139):505-512.
4Guo R,Pittler MH,Ernst E.Herbal medicines for the treatment of COPD:a systematic review[J].Eur Respir J,2006(28):330-338.