@article{guimarães_guimarães_hallak_abrão_machado-de-sousa_2021,  title={Nitrous oxide as an adjunctive therapy in major depressive disorder: a randomized controlled double-blind pilot trial},  volume={43},  ISSN={1516-4446},  url={https://doi.org/10.1590/1516-4446-2020-1543},  DOI={10.1590/1516-4446-2020-1543},  number={5},  journal={Brazilian Journal of Psychiatry},  publisher={Associação Brasileira de Psiquiatria},  author={Guimarães, Mara C. and Guimarães, Tiago M. and Hallak, Jaime E. and Abrão, João and Machado-de-Sousa, João P.},  year={2021},  month={Sep},  pages={484–493} }