@article{tosta_2021,  title={The seven constitutive respiratory defense barriers against SARS-CoV-2 infection},  volume={54},  ISSN={0037-8682},  url={https://doi.org/10.1590/0037-8682-0461-2021},  DOI={10.1590/0037-8682-0461-2021},  journal={Revista da Sociedade Brasileira de Medicina Tropical},  publisher={Sociedade Brasileira de Medicina Tropical - SBMT},  author={Tosta, Eduardo},  year={2021},  pages={e0461–2021} }