[8]
Global Strategy for the Diagnosis,Management,and Prevention of Chronic Obstructive Pulmonary Disease(2006) .2 Gold executive committee. Am J Respir Crit Care Med . 2006
[8]
Global Strategy for the Diagnosis,Management,and Prevention of Chronic Obstructive Pulmonary Disease(2006) .2 Gold executive committee. Am J Respir Crit Care Med . 2006