F. Dadkhah, M. R. Safarinejad, E. Amini, M. Soleimani, and A. R. Lashay, “Is Bowel Preparation Necessary Before kidney-Ureter-Bladder Radiography and Intravenous Urography?”, Urol J, vol. 9, no. 3, pp. 600–605, Aug. 2012.