“Mortality and Severity of COVID-19 Patients with Chronic Obstructive Pulmonary Disease: A Meta-Analysis”, J Epidemiol Public Healt, vol. 6, no. 3, pp. 333–346, Jul. 2021, Accessed: Dec. 26, 2025. [Online]. Available: https://jepublichealth.com/index.php/jepublichealth/article/view/428