. 2021 Apr 22;12:638556. doi: 10.3389/fphar.2021.638556
Copyright © 2021 Zhao, Liu, Liu, Peng, Huang, Li, Wang, Xu, Sun, Qi, Ling, Li, Zhang, Mao and Qu.
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FIGURE 1.
Study flowchart. HDIVC, high dose intravenous vitamin C; COVID-19, coronavirus disease 2019.