@article{villanueva_hemstreet iii_2008,  title={Difficult male urethral catheterization: a review of different approaches},  volume={34},  ISSN={1677-5538},  url={https://doi.org/10.1590/S1677-55382008000400002},  DOI={10.1590/S1677-55382008000400002},  number={4},  journal={International braz j urol},  publisher={Sociedade Brasileira de Urologia},  author={Villanueva, Carlos and Hemstreet III, George P.},  year={2008},  month={Jul},  pages={401–412} }