@article{sinha_balayla_2020,  title={Sequential battery of COVID-19 testing to maximize negative predictive value before surgeries},  volume={47},  ISSN={0100-6991},  url={https://doi.org/10.1590/0100-6991e-20202634},  DOI={10.1590/0100-6991e-20202634},  journal={Revista do Colégio Brasileiro de Cirurgiões},  publisher={Colégio Brasileiro de Cirurgiões},  author={SINHA, NEERAJ and BALAYLA, GALIT},  year={2020},  pages={e20202634} }