Khamtue, K., P. Sitilertpisan, and S. Dacha. “Comparative effects of wearing N95, surgical, cloth, and PM2.5 masks during six-minute walk test on dyspnea, breathing effort, oxygen saturation, and functional capacity in pre-aging individuals”. Journal of Associated Medical Sciences, vol. 56, no. 2, Jan. 2023, pp. 8-17, https://he01.tci-thaijo.org/index.php/bulletinAMS/article/view/258370.