@article{liu_yang_wang_mi_tang_zheng_2020,  title={Immune status could be associated with severity in COVID-19 patients},  volume={66},  ISSN={0104-4230},  url={https://doi.org/10.1590/1806-9282.66.S2.13},  DOI={10.1590/1806-9282.66.S2.13},  journal={Revista da Associação Médica Brasileira},  publisher={Associação Médica Brasileira},  author={Liu, Chuan and Yang, Jiahui and Wang, Wancong and Mi, Yang and Tang, Youcai and Zheng, Pengyuan},  year={2020},  pages={13–16} }