Srisaeng, Suppasit. βAn investigation of COVID-1 9 outbreak in a superstore at Chiangmai province, October - November 2021β. Phetchabun Medical Journal 3, no. 2 (August 31, 2023): 174β84. accessed April 8, 2025. https://he03.tci-thaijo.org/index.php/PMJ/article/view/3013.