Khiaocharoen, O. ., . S. . Pannarunothai, A. . Riewpaiboon, and C. . Zungsontiporn. “Estimating Patient-Level Costs for Acute and Sub-Acute Inpatient Services in Thailand”. Siriraj Medical Journal, vol. 64, no. 5, July 2020, pp. 157-62, https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/244188.