Posawang P, Kittila S, Maneetong Y. “Effectiveness of Electrical Stimulation for Deglutition Disorder in Stroke: A Systematic Review”. Journal of The Department of Medical Services, vol. 43, no. 4, Aug. 2018, pp. 49-53, https://he02.tci-thaijo.org/index.php/JDMS/article/view/247879.