Phongmanjit, Phichai. 2021. “Hand-made Rubber Band Ligater (MUF. - PP Ligater, V1) for Treatment of Hemorrhoids”. Greater Mekong Subregion Medical Journal 1 (2). Chiangrai, Thailand:55-58. https://he02.tci-thaijo.org/index.php/gmsmj/article/view/250763.