Forgot?
Smoking Cessation
Smoking
Ipratropium
Bronchodilator Agents
Forced Expiratory Volume
Vital Capacity
Obstructive Lung Diseases
Pulmonary Disease, Chronic Obstructive
Respiratory Function Tests
Spirometry
Administration, Inhalation
Intervention Studies
Clinical Trials as Topic
Treatment Outcome
Time Factors
Longitudinal Studies
Risk Factors
Sex Factors
Proportional Hazards Models
Lung
Co-Publications
20
17
14
12
11
10
6
5
4
3
Flash Player Required