Xiao, J., X. Wang, J. Li, M. Wang, T. Han, C. Zhang, Y. Du, G. Hao, and Y. Tian. “Treatment of Upper Urinary Tract Stones With Flexible Ureteroscopy in Children”. Canadian Urological Association Journal, Vol. 13, no. 3, Aug. 2018, doi:10.5489/cuaj.5283.