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Case Control Studies
Administration, Inhalation
Cohort Studies
Risk Factors
Logistic Models
Odds Ratio
Time Factors
Risk
Factual Databases
Bias (Epidemiology)
Incidence
Risk Assessment
Pulmonary Disease, Chronic Obstructive
Asthma
Quebec
Saskatchewan
Great Britain
Adrenal Cortex Hormones
Bronchodilator Agents
Antirheumatic Agents
Co-Publications
48
18
15
13
11
10
9
8
7
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