@article{silva_oliveira_nunes_2022,  title={Comparison between intravenous and intrathecal clonidine for postoperative analgesia of patients submitted to laparoscopic cholecystectomy: randomized clinical trial},  volume={72},  ISSN={2352-2291},  url={https://doi.org/10.1016/j.bjane.2021.03.029},  DOI={10.1016/j.bjane.2021.03.029},  number={1},  journal={Brazilian Journal of Anesthesiology},  publisher={Sociedade Brasileira de Anestesiologia (SBA)},  author={Silva, Christiane Rodrigues da and Oliveira, Cinthya Iamile Frithz Brandão de and Nunes, Juscimar Carneiro},  year={2022},  month={Jan},  pages={135–141} }