“Mortality and Severity of COVID-19 Patients With Chronic Obstructive Pulmonary Disease: A Meta-Analysis”. Journal of Epidemiology and Public Health 6, no. 3 (July 16, 2021): 333–346. Accessed October 31, 2025. https://jepublichealth.com/index.php/jepublichealth/article/view/428.