@article{zewu_cui_feng_yang_chen_2019,  title={Comparison of retrograde flexible ureteroscopy and percutaneous nephrolithotomy in treating intermediate-size renal stones (2-3cm): a meta-analysis and systematic review},  volume={45},  ISSN={1677-5538},  url={https://doi.org/10.1590/S1677-5538.IBJU.2018.0510},  DOI={10.1590/S1677-5538.IBJU.2018.0510},  number={1},  journal={International braz j urol},  publisher={Sociedade Brasileira de Urologia},  author={Zewu, Zhu and Cui, Yu and Feng, Zeng and Yang, Li and Chen, Hequn},  year={2019},  month={Jan},  pages={10–22} }