@article{nunes_colares_montenegro_2017,  title={Is Pethidine Safe during Labor? Systematic Review},  volume={39},  ISSN={0100-7203},  url={https://doi.org/10.1055/s-0037-1604065},  DOI={10.1055/s-0037-1604065},  number={12},  journal={Revista Brasileira de Ginecologia e Obstetrícia},  publisher={Federação Brasileira das Sociedades de Ginecologia e Obstetrícia},  author={Nunes, Rogevando Rodrigues and Colares, Paulo Giordano Baima and Montenegro, Juliana Pinto},  year={2017},  month={Dec},  pages={686–691} }