Thammakun, Theerawut, and Annichcha Singhkhanan. 2022. “Work-related Stress during the Crisis of COVID-19 Pandemic among Personnel of Sub-district Health Promoting Hospitals in Border Area of Chiang Rai Province”. Journal of the Office of Disease Prevention and Control 9 Nakhon Ratchasima 28 (3):16-24. https://he02.tci-thaijo.org/index.php/ODPC9/article/view/257176.