Teja, K., V. Lugade, and P. Silsupadol. “Effect of Smartphone Location and Walking Speed on Spatiotemporal Gait Parameters in Older Adults”. Journal of Associated Medical Sciences, vol. 50, no. 3, Sept. 2017, p. 507, https://he01.tci-thaijo.org/index.php/bulletinAMS/article/view/99183.