Songsaeng, Dittapong, Monthanee Puengphong, Kobkun Muangsomboon, Vutisiri Veerasarn, and Anek Suwanbundit. 2006. “Necessary for CT Whole Abdomen in Post Chemoradiation of Rectosigmoid Cancer Stage 3: A Comparative Study”. Siriraj Medical Journal 58 (7):903-6. https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/245852.