@article{reddy_shaik_2016,  title={Outcome and complications of percutaneous nephrolithotomy as primary versus secondary procedure for renal calculi},  volume={42},  ISSN={1677-5538},  url={https://doi.org/10.1590/S1677-5538.IBJU.2014.0619},  DOI={10.1590/S1677-5538.IBJU.2014.0619},  number={2},  journal={International braz j urol},  publisher={Sociedade Brasileira de Urologia},  author={Reddy, S. V. Krishna and Shaik, Ahammad Basha},  year={2016},  month={Mar},  pages={262–269} }