Ueawattanasirikul, C. ., S. . Boripuntakul, K. . Wonglangka, and D. Pinkaew. “Correlation between thoracic kyphosis and pulmonary function in elderly”. Journal of Associated Medical Sciences, vol. 53, no. 2, Apr. 2020, pp. 23-30, https://he01.tci-thaijo.org/index.php/bulletinAMS/article/view/235323.