@article{duan_zhu_zhong_li_zeng_2019,  title={Balloon dilation for failed pyeloplasty in children?},  volume={45},  ISSN={1677-5538},  url={https://doi.org/10.1590/S1677-5538.IBJU.2018.0407},  DOI={10.1590/S1677-5538.IBJU.2018.0407},  number={3},  journal={International braz j urol},  publisher={Sociedade Brasileira de Urologia},  author={Duan, Haifeng and Zhu, Wei and Zhong, Wen and Li, Xiaohang and Zeng, Guohua},  year={2019},  month={May},  pages={617–620} }