WANG C,XU J,YANG L,et al.Prevalence and risk factors of chronic obstructive pulmonary disease in China (the China Pulmonary Health [CPH] study):a national cross-~sectional study[J].Lancet,2018,391(10131):1706-1717.
Hoogendoorn M,Hoogenveen RT,Rutten-van Mlken MP,et al.Case fatality of COPD exacerbations:a meta-analysis and statistical model-ling approach[J].Eur Respir J,2011,37(3):508-515.
Piquet J,Chavaillon JM,David P,et al.High-risk patients following hospitalisation for an acute exacerbation of COPD[J].Eur Respir J,2013,42(4):946-955.