5GOLD Executive Committee. Global strategy for the diagnosis, management, and prevention of chronic obstructive pulmonary disease ( Revised 2011 ) [ EB/OL]. [2013-02-04]. http:// www. goldcopd, com.
6Calverley PM, Burge PS, Spencer S, et al. Bronchodilator reversibility testing in chronic obstructive pulmonary disease.Thorax, 2003, 58: 659-664.
7Cottin V, Cordier JF. The syndrome of combined pulmonary fibrosis and emphysema. Chest, 2009, 136 : 1-2.
8Jones PW. Health status and the spiral of decline. COPD, 2009, 6 : 59-63.
9Lange P, Marott JL, Vestbo J, et al. Prediction of the clinical course of chronic obstructive pulmonary disease, using the new GOLD classification: a study of the general population. Am J Respir Crit Care Med, 2012, 186: 975-981.
10Han MK, Muellerova H, Curran-Everett D, et al. GOLD 2011 disease severity classification in COPDGene: a prospective cohortstudy [ J/OL ] . Lancet, 2012: http://dx, doi. org/lO. 1016/ s2213-2600 ( 12 ) 70044-9. [ publication online ahead of print September 1, 2012].