Wiangnon, S., K. Suwanrungruang, and S. Kamsa-ard. ‚ÄúCholangiocarcinoma in Khon Kaen Province‚ÄĚ. Srinagarind Medical Journal, vol. 27, Aug. 2013, pp. 326-30, https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/11157.