Funding for this research was provided by:
National Natural Science Foundation of China (81672092)
Natural Science Foundation of Zhejiang Province (LY15H030012)
Scientific Technology Projects of Health and Family Planning Commission of Zhejiang Province (2017KY066)
Major National S&T Projects for Infectious Diseases (2017ZX10202201-002-004)
Received: 30 October 2018
Accepted: 29 July 2019
First Online: 7 August 2019
Ethics approval and consent to participate
: The procedures were formulated in accordance with the Declaration of Helsinki and approved by the Medical Ethics Committee of the First Affiliated Hospital, School of Medicine, Zhejiang University (Hangzhou, China). Written informed consent was obtained from all participants.
: Not applicable
: The authors declare that they have no competing interests.