@article{ho_2011,  title={Re: comparison between two shock wave regimens using frequencies of 60 and 90 impulses per minute for urinary stones},  volume={66},  ISSN={1807-5932},  url={https://doi.org/10.1590/S1807-59322011000100033},  DOI={10.1590/S1807-59322011000100033},  number={1},  journal={Clinics},  publisher={Faculdade de Medicina / USP},  author={Ho, Christopher C. K},  year={2011},  pages={181–181} }