1Fabbri LM,Luppi F,Beghe B,et al, Update in chronic obstructive pulmonary disease 2005. Am J Respir Crit Care Med,2006,173:1056 1065.
2Pauwels RA,Buist A, Calverley PMA,et al. Global strategy for the diagnosiz,management,and'prevention of chronic obstructive pulmonary disease. NHLBI/WHO global initiative for chronic obstructive lung disease (GOLD) workshop summary. Am J Respir Crit Care Med,2001,163:1256-1276.
3GOLD Executive Committee, Global strategy for the diagnosis,management, and prevention of chronic obstructive pulmonary disease (Updated 2005). www.goldcopd.com
4GOLD Executive Committee. Global strategy for the diagnosis,management, and prevention of chronic obstructive pulmonary disease (Updated 2006). www. goldcopd.com