Xue, S.- wei, Zhang, M.- bo, Luo, Y.- kun, Li, N. and Shi, S.- yi 2022. A comparative study of ultrasound-guided percutaneous nephrolithotripsy and x-ray-guided percutaneous nephrolithotripsy in the treatment of complex renal calculi without hydronephrosis. Pakistan Journal of Medical Sciences. 38, 8 (Oct. 2022). DOI:https://doi.org/10.12669/pjms.38.8.5904.