Funding for this research was provided by:
National Natural Science Foundation of China (81871709)
National Key Programs for Infectious Diseases of China (2017ZX10103008-005)
Natural Science Foundation of Zhejiang Province (LY16H200001)
Scientific Research Projects of Education of Zhejiang Province (Y201534117)
Scientific Technology Projects of Health and the Family Planning Commission (2015KYB149)
Article History
Received: 30 April 2020
Accepted: 11 August 2020
First Online: 14 August 2020
Ethics approval and consent to participate
: This study was in compliance with ethical standards.
: Not applicable.
: The authors declare that they have no conflicts of interest.