Phakdepiboon, T., and W. Chira-Adisai. “Efficacy of Treadmill Walking Training on Gait Performance and Balance in Thai Elderly”. Ramathibodi Medical Journal, vol. 38, no. 4, Dec. 2015, pp. 264-73, https://he02.tci-thaijo.org/index.php/ramajournal/article/view/57461.