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Pulmonary Disease, Chronic Obstructive
Bronchitis, Chronic
Acute Disease
Primary Health Care
Spirometry
Epidemiologic Methods
Pilot Projects
Spain
Quality of Life
Social Class
Educational Status
Anti-Bacterial Agents
Aza Compounds
Clarithromycin
Amoxicillin
Quinolines
Physician's Practice Patterns
Questionnaires
Data Collection
Forced Expiratory Volume
Co-Publications
10
7
5
3
2
1
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