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Scopolamine Derivatives
Bronchodilator Agents
Cholinergic Antagonists
Albuterol
Vitamin B 12
Ipratropium
Forced Expiratory Volume
Pulmonary Disease, Chronic Obstructive
Asthma
Vitamin B 12 Deficiency
Double-Blind Method
Spirometry
Administration, Inhalation
Erythrocyte Indices
Treatment Outcome
Time Factors
Quality of Life
Severity of Illness Index
Prospective Studies
Smoking
Co-Publications
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3
2
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