Text and Data Mining valid from 2019-07-15
Received: 4 January 2019
Accepted: 26 June 2019
First Online: 15 July 2019
Compliance with ethical standards
: Written consent was obtained from each adult volunteer before serum collection. The Ethics Committee of Affiliated Hospital of Hangzhou Normal University granted approval of this study.
: The authors declare that they have no conflict of interest.