Ghirardo, Sergio, et al. “Follow-Up Ultrasound After Pyeloplasty Should Be Performed With An Empty Bladder: A Lesson from Monsieur Laplace”. Archives of Clinical and Biomedical Research, vol. 3, no. 6, Oct. 2019, pp. 357-60, https://fortunejournals.org/ojs/index.php/acbr/article/view/14745.