@article{kotze_froehner junior_freitas_diniz_steckert-filho_2011,  title={Analysis of direct costs of anesthesia-related materials between spinal and venous anesthesia with propofol associated with local perianal block in hemorrhoidectomy},  volume={31},  ISSN={2237-9363},  url={https://doi.org/10.1590/S2237-93632011000300007},  DOI={10.1590/S2237-93632011000300007},  number={3},  journal={Journal of Coloproctology (Rio de Janeiro)},  publisher={Sociedade Brasileira de Coloproctologia},  author={Kotze, Paulo Gustavo and Froehner Junior, Ilario and Freitas, Cristiano Denoni and Diniz, Fábio and Steckert-Filho, Álvaro},  year={2011},  month={Jul},  pages={268–275} }