Pambudi, G. C., Rahardjo, S. S., & Sumardiyono, S. (2021). A Meta-Analysis of Correlations between Chronic Obstructive Pulmonary Disease, Smoking, and Severity of COVID-19. Journal of Epidemiology and Public Health, 6(4), 415–425. Retrieved from https://www.jepublichealth.com/index.php/jepublichealth/article/view/437