Nam, H. M., Hoàng, T. T., Hạnh, H. T. H., Khương, C. B., & Lan, N. T. P. (2023). 30. Willingness to pay for the Covid-19 vaccine available in Vietnam and some factors related. Journal of Medical Research, 163(2), 265-274. https://doi.org/10.52852/tcncyh.v163i2.1211