Abbas, Syed Ali, Samina Saboor, and Syeda Nabeera Abbas. “Prevalence of Comorbidities in Patients Admitted With Acute Exacerbation of COPD in a Tertiary Care Hospital”. Pakistan Journal of Chest Medicine 24, no. 3 (September 16, 2018): 152–157. Accessed May 31, 2026. https://pjcm.net/index.php/pjcm/article/view/545.