DEMAND, ABILITY TO PAY FOR COVID-19 VACCINE AND ASSOCIATED FACTORS OF HANOI MEDICAL UNIVERSITY STUDENTS IN 2020. YHCĐ [Internet]. 2022 Dec. 8 [cited 2026 Sept. 8];63(Số tiếng Anh). Available from: https://tapchiyhcd.vn/index.php/yhcd/article/view/552