F. . Sohail, T. . Ashraf, . A. AzamKhan, M. . Abid, M. IkramAli, and N. Shahid, “Microbiological Etiology of Chronic Cough Associated with Acute Exacerbation of Chronic Obstructive Pulmonary Disease (COPD): A Study from Karachi, Pakistan”, PJMD, vol. 9, no. 4, pp. 52–57, May 2024.