Azhar, R. A., M. M. Alghamdi, A. A. Khawaji, A. M. . Nassir, S. Munshi, W. Tayeb, and M. A. Elkoushy. “Effective Ureteral Access Sheath Insertion During Flexible Ureteroscopy: Influence of the Ureteral Orifice Configuration”. Canadian Urological Association Journal, vol. 16, no. 7, Feb. 2022, pp. E375-80, doi:10.5489/cuaj.7656.