3Ong N, Wang C, YaoW, et al. Prevalence of chronicobstructive pulmonarybdiseases in china: a large, population-basedsurvey[J]. Am Respir CritCare Med,2007,176 :753-760.
5Rabe K F, Hurd S, Anzueto A, et al. Global strategy for the Di- agnosis, management, and revention of chronic obstructive pul- moary disease:GOLD executive summary[J]. Am J Respir Crit Care Med, 2007,176 : 532-555.
6White A J ,Gompenz S, Stockley R A. Chronic obstructive pul- monarydisease. The aetiology of exacerbations of chronic ob- structive pulmonary disease[J]. Thorax,2003,58(1) :73-80.
7Anthonisen N R, Manfreda J, Warren C P, et al. Antibiotic therapy in exacerbation of chronic obstructive pulmonary dis- ease[J]. Ann Intern Med, 1997,106 : 196-204.
8Celli B R,Cote C G,Marin J M,et al. The bodymass index,air- floweapacity index in chronic obstructive pulmonary disease [J]. N Engl J Med,2004,350,1005-1012.
9Maleki-Yazdi M R, Lewczuk C K, Haddon J M, et al. Early de- teetionand impaired quality of life in COPD GOLD stage 0ta pi- lot study[J]. COPD, 2007,4 : 313-320.
10Joo M J,Lee T A,Barile B,et al. Patterns of healthcare utili- zation by COPD severityl a pilot study[J]. Lung, 2008,186 :307-312.
3[1]Andersson I,Johansson S,Brode N,et al.Long-term oxygen and quality of life in eldly patients hospitaled due to severe exacerbation of COPD.A 1 year follow-up study[J].Respir Med,2002,96 (11):944-949.
4[4]Ringbaek TJ,Viskum K,Lange P.Non-continuous home oxygen therapy:utilization,symptomatic effect and prognosis,date from a national register on home oxygen therapy[J].Respir Med,2001,95 (12):980-985.
