Vathanophas, V., and N. Jabbourb. “Improving International Standards in Surgical and Procedural Training through Comparative Operative Log Growth Charts”. Siriraj Medical Journal, vol. 70, no. 2, June 2018, pp. 123-6, https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/127446.