Chronic Obstructive Pulmonary Disease (COPD) is a disabling condition in which the patient's airways become obstructed causing persistent and progressive breathlessness, which can greatly impair the ability to lead a normal life. COPD is the sixth leading cause of chronic morbidity and mortality and is a major socio-economic burden in industrialized nations. Although COPD cannot be cured, there are effective treatments that can greatly increase quality...