Khaothong, P., S. Vongsaroj, N. Wattakiyanon, T. Nanna, and N. Stansook. “Evaluating variability of bladder volume using ultrasound-guided radiation therapy for prostate cancer”. Journal of Thai Association of Radiation Oncology, vol. 28, no. 1, May 2022, pp. R16-R34, https://he01.tci-thaijo.org/index.php/jtaro/article/view/252792.