@article{jiyu zhao2020of,
  title={Comparison of Percutaneous Nephrolithotomy and Ureteroscopic Lithotripsy for Upper Ureteral Calculi},
  author={jiyu zhao,sheng yang,zejun xiao,jun zhang,jia liu,ying qi,xianen gu},
  journal={Signa Vitae},
  volume={16},
  number={2},
  pages={104--108},
  doi = {10.22514/sv.2020.16.0054},
  year={2020}
}