Tummarintra, Paiboon, Panop Limratana, Kittiphong Sujirattanawimol, and Chatchawan Srisawat. 2018. “The Contamination of Intravenous Fluid by Felt-Tip Marking Pen Ink: A Pilot Study”. Siriraj Medical Journal 70 (4):349-54. https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/153939.