الفهرس 
Clinical features of COPDOnly 14 pages are availabe for public view
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Abstract
This study was conducted on 48subjects divided into four main groups: 12 normal control sublects, 12 asymptomatic cigarette smokers 12 COPD smokers and 12 COPD non-smokers. Methacholine bronchial challenge was done for all of them to study the magnitude of non-specific bronchial responsiveness.