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Pulmonary Disease, Chronic Obstructive
Pulmonary Emphysemas
Emphysema
Dyspnea
Quality of Life
Treatment Outcome
Severity of Illness Index
Exercise Tolerance
Multivariate Analysis
Risk Factors
Cohort Studies
Forced Expiratory Volume
Respiratory Function Tests
Pneumonectomy
Oxygen Inhalation Therapy
X Ray Computed Tomography
Bronchodilator Agents
United States
Smoking
Exercise
Co-Publications
25
23
22
11
9
8
7
6
5
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