Funding for this research was provided by:
Chinese COVID-19 scientific research emergency project (2020YFC0844100, 2020YFC0846800, 2020ZYLCYJ05-14)
China Mega-Project for Infectious Diseases (2017ZX10203202)
China Mega-Project for Innovative Drugs (2016ZX09101065)
Received: 13 January 2021
Accepted: 23 March 2021
First Online: 31 March 2021
: This study has been approved by the Ethics Committee of Peking University First Hospital (2020-032) and waived informed consent because data were de-identified.
: Not applicable.
: All authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.