Pattanaprateep, O., P. Pongcharoensuk, and S. Kaojarern. “Overviews of Data Mining in Hospital Information System”. Ramathibodi Medical Journal, vol. 32, no. 2, June 2009, pp. 95-100, https://he02.tci-thaijo.org/index.php/ramajournal/article/view/175332.