@article{mattar_2020,  title={Breath tests for gastrointestinal diseases - will it be safe to conduct breath tests after the COVID-19 pandemic?},  volume={75},  ISSN={1807-5932},  url={https://doi.org/10.6061/clinics/2020/e2092},  DOI={10.6061/clinics/2020/e2092},  journal={Clinics},  publisher={Faculdade de Medicina / USP},  author={Mattar, Rejane},  year={2020},  pages={e2092} }