Leerasiri, P., and B. Puttanapitak. “Measurement of Post Void Residual Urine Volume Using Portable 3D Ultrasound Compared With Urinary Catheterization”. Siriraj Medical Journal, vol. 69, no. 3, June 2017, pp. 110-3, https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/89536.