Songsaeng, D., M. . Puengphong, K. . Muangsomboon, V. . Veerasarn, and A. . Suwanbundit. “Necessary for CT Whole Abdomen in Post Chemoradiation of Rectosigmoid Cancer Stage 3: A Comparative Study”. Siriraj Medical Journal, vol. 58, no. 7, July 2006, pp. 903-6, https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/245852.