@article{laranjeira_pillon_dunn_2000,  title={Environmental tobacco smoke exposure among non-smoking waiters: measurement of expired carbon monoxide levels},  volume={118},  ISSN={1516-3180},  url={https://doi.org/10.1590/S1516-31802000000400003},  DOI={10.1590/S1516-31802000000400003},  number={4},  journal={Sao Paulo Medical Journal},  publisher={Associação Paulista de Medicina - APM},  author={Laranjeira, Ronaldo and Pillon, Sandra and Dunn, John},  year={2000},  month={Jul},  pages={89–92} }