Funding for this research was provided by:
National Key Research and Development Project of the Ministry of Science and Technology (2018YFC1313700)
“Gaoyuan” project of Pudong Health and Family Planning Commission (PWYgy2018-6)
Received: 14 May 2020
Accepted: 28 May 2020
First Online: 16 June 2020
Ethics approval and consent to participate
: The study was approved by the 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 authors declare no competing interests.