6Gulsvik A. The global burden and impact of chronic obstructive pulmonary disease worldwide[J]. Monaldi Arch Chest Dis, 2001 ,56(3) :261 - 264.
7The AGREE Collaboration. Appraisal of Guidelines Research and Evaluation (AGREE) instrument [ EB/OL]. [2008- 11 -06]. http ://www. agreecollaboration, org.
8Shiffman RN, Shekelle P, Overhage JM, et al. Standardized reporting of clinical practice guideline: a proposal from the Conference on Guidelin Standardization[J]. Ann Intern Med,2003, 139(6):493 - 498.
10Rabe KF, Hurd S, Anzueto A, et al. Global strategy for the diagnosis, management, and prevention of chronic obstructive pulmonary disease: GOLD executive summary [J]. Am J Respir Crit Care Med. 2007,176(6) :532 -555.