Funding for this research was provided by:
Department of Science and Technology of Sichuan Province (2020YFS0004)
COVID-19 epidemic Science and Technology Project of West China Hospital of Sichuan University (HX2019nCoV008)
COVID-19 epidemic Science and Technology Project of West China Hospital of Sichuan University (HX2019nCoV066)
Office of Emergency Operations (2020scunCoV Emergency 10003)
Received: 13 April 2020
Accepted: 2 September 2020
First Online: 21 September 2020
Ethics approval and consent to participate
: Approval for this study was obtained from the Biomedical Research Ethics Committee of West China Hospital, Sichuan University (ChiCTR2000030542). Written informed consent was obtained from all participants before sample collection and the data analyzed in our study were anonymized before its use.
: Not applicable.
: The authors declare that they have no competing interests.