Haggag, Y. M., Morsy, G. A., Badr, M. M., Al Emam, A. B. A., Mourad, M. M., Farid, M., & Etafy, M. (2013). Comparative study of laparoscopic pyelolithotomy versus percutaneous nephrolithotomy in the management of large renal pelvic stones. Canadian Urological Association Journal, 7(3-4), E171–175. https://doi.org/10.5489/cuaj.490