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Pulmonary Disease, Chronic Obstructive
Bronchodilator Agents
Theophylline
Air Pollutants
Sulfur Dioxide
Brazil
Randomized Controlled Trials
Poisson Distribution
Exercise Tolerance
Forced Expiratory Volume
Air Pollution
Maximal Voluntary Ventilation
Inspiratory Capacity
Peak Expiratory Flow Rate
Emergency Service, Hospital
Evidence-Based Medicine
Administration, Oral
Patients' Rooms
Particulate Matter
Epidemiological Monitoring
Co-Publications
3
2
1
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