Mongkolsomlit, Sirima, and Jayanton Rawdaree. “How to Detect and Handle Confounding Factors”. Vajira Medical Journal : Journal of Urban Medicine 54, no. 2 (September 29, 2011): 223–235. accessed April 22, 2026. https://he02.tci-thaijo.org/index.php/VMED/article/view/452.