The study was approved by the Ethical Review Board of the First Affiliated Hospital, College of Medicine, Zhejiang University. We thank all the participants for collecting data and testing specimens, and the National Institute of Diagnostics and Vaccine Development in Infectious Diseases for support in this project.
Conflict of interest statement
Authors’ conflict of interest disclosure: The authors stated that there are no conflicts of interest regarding the publication of this article.
Research funding: National 863 Program for the Biological and medical technology (no. 2011AA02A100) and the National Key Programs for Infectious Diseases of China (no. 2012ZX10002005.
Employment or leadership: None declared.
Honorarium: None declared.
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