Shibata, Yosuke, Yasunari Kurita, Kaho Morishita, and Toshiyuki Ojima. “Prevalence of Use of Sports Trainer Services in Japanese High Schools: A Nationwide Survey”. IJORER : International Journal of Recent Educational Research 5, no. 6 (December 7, 2024): 1339-1352. Accessed August 2, 2025. https://journal.ia-education.com/index.php/ijorer/article/view/706.