Sungkhun, P. “Comparison of Direct Hospitalization Costs During Staged Versus Simultaneous Total Knee Arthroplasty: Thailand National Health Security Program”. Vajira Medical Journal : Journal of Urban Medicine, vol. 61, no. 3, Sept. 2017, pp. 183-90, https://he02.tci-thaijo.org/index.php/VMED/article/view/196167.