พันธนู พ. . “Factors Associated With Severe Symptoms in Patients Infected With the Coronavirus 2019 (COVID-19) at Bangchak Hospital in Samut Prakan Province”. Thailand Journal of Health Promotion and Environmental Health, vol. 45, no. 3, Jan. 2023, pp. 118-2, https://thaidj.org/index.php/for4d/article/view/13100.