Wandee, Jaroon, Auemduan Prawan, Laddawan Senggunprai, Ornanong Tusskorn, and Veerapol Kukongviriyapan. 2017. “Metformin Enhances Cisplatin-Induced Cell Cytotoxicity and Antiproliferation in Cholangiocarcinoma Cells”. Srinagarind Medical Journal 32 (4):51. https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/94293.