“ASSESSMENT CHANGES OF DISEASE MODEL IN THE TIME COVID AND SOME RELATED FACTORS AT REQUEST-BASED POLY CLINIC DEPARMENT – NATIONAL LUNG HOSPITAL”. Vietnam Journal of Community Medicine 62, no. 7 (2021) (December 9, 2021). Accessed September 8, 2026. https://tapchiyhcd.vn/index.php/yhcd/article/view/209.