Laupattarakasem, W., and W. Kowsuwon. “Contimuous Passive Motion (CPM) Device – Ortho. KKU. Medel”. Srinagarind Medical Journal, vol. 1, no. 2, Nov. 2013, pp. 87-98, https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/13260.