@article{fischer_2004,  title={What do petrochemical workers, healthcare workers, and truck drivers have in common? Evaluation of sleep and alertness in Brazilian shiftworkers},  volume={20},  ISSN={0102-311X},  url={https://doi.org/10.1590/S0102-311X2004000600033},  DOI={10.1590/S0102-311X2004000600033},  number={6},  journal={Cadernos de Saúde Pública},  publisher={Escola Nacional de Saúde Pública Sergio Arouca, Fundação Oswaldo Cruz},  author={Fischer, Frida Marina},  year={2004},  month={Nov},  pages={1732–1738} }