Funding for this research was provided by:
National Natural Science Foundation of China (81870064)
“Gaoyuan” project of Pudong Health and Family Planning Commission (PWYgy2018-06)
National Key R&D Program (2018YFC1313700)
Research Foundation of Shanghai Science and Technology Commission (18140904100)
Received: 14 July 2020
Accepted: 7 October 2020
First Online: 23 October 2020
Ethics approval and consent to participate
: The study was approved by Shanghai East Ethics Committee. Written informed consent was waived by the Ethics Committee due to the retrospective nature of this study and rapid emergence of this infectious disease.
: All co-authors have approved the manuscript and agreed with the publication. This manuscript did not contain any individual person’s data in any form.
: The authors declare no competing interests.