P. . Khaothong, S. . Vongsaroj, N. Wattakiyanon, T. . Nanna, and N. Stansook, “Evaluating variability of bladder volume using ultrasound-guided radiation therapy for prostate cancer”, J Thai Assn of Radiat Oncol, vol. 28, no. 1, pp. R16-R34, May 2022.