International Journal of Chronic Obstructive Pulmonary Disease International Journal of Chronic Obstructive Pulmonary Disease, 16, 783-794. DOVE MEDICAL PRESS LTD International journal of COPD, 16, pp. 783-794 International journal of COPD, 16, 783-794 INTERNATIONAL JOURNAL OF CHRONIC OBSTRUCTIVE PULMONARY DISEASE, 16, 783-794. DOVE MEDICAL PRESS LTD