Introduction
From a global perspective morbidity and mortality associated with chronic obstructive pulmonary disease (COPD) is increasing. The most important cause of the disease is exposure to airway irritants, mainly from tobacco smoke, but…

From a global perspective morbidity and mortality associated with chronic obstructive pulmonary disease (COPD) is increasing. The most important cause of the disease is exposure to airway irritants, mainly from tobacco smoke, but…