Apichutboonchock, S., and W. Nadoon. “ Sanpasitthiprasong: A Comparative Study Between Academic Year 2015 and 2016”. Vajira Medical Journal : Journal of Urban Medicine, vol. 63, no. 2, Apr. 2019, pp. 119-28, https://he02.tci-thaijo.org/index.php/VMED/article/view/211595.