Naomi Katayama, Mayumi Hirabayashi, and Shoko Kondo. 2020. “Research on the Combination of Commercially Available Thickeners and Commercially Available Nursing Food - By Using Universal Design Food: UDF (Do Not Have to Bite)”. Global Journal of Medical Research 20 (K11):49-53. https://medicalresearchjournal.org/index.php/GJMR/article/view/2230.