Namwong, W., J. Udomputtachat, T. Asnathip, S. Phadungkit, T. Thaweewannakij, and S. Amatachaya. “Proportion and Walking Speed of Individuals With Various Walking Ability”. Srinagarind Medical Journal, vol. 37, no. 2, Apr. 2022, pp. 139-45, https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/253602.