“A Meta-Analysis of the Effects of Secondhand Smoke Exposure toward the Incidence of Pneumonia in Children Under Five” (2021) Journal of Epidemiology and Public Health, 5(4), pp. 410–419. Available at: https://jepublichealth.com/index.php/jepublichealth/article/view/344 (Accessed: 26 December 2025).