Naomi Katayama, and Shyoko Kondo. “Results of Questionnaire Survey on Gum Chews of Thirty-Days for University Female Students”. Global Journal of Medical Research 20, no. K9 (July 15, 2020): 15–17. Accessed May 1, 2024. https://medicalresearchjournal.org/index.php/GJMR/article/view/2181.