Wuttayakorn, Thunyaporn, and Pornchai Sithisarankul. “Risk Factors for COVID-19 Infection”. Journal of Preventive Medicine Association of Thailand 11, no. 2 (September 8, 2021): 447–464. Accessed April 25, 2024. https://he01.tci-thaijo.org/index.php/JPMAT/article/view/249855.