Ji, Xue-Yue https://orcid.org/0000-0002-5439-4047
Huang, Li-Yuan
Song, Jia
Fei, Chun-Nan
Liu, Jun
Liu, He
Article History
Received: 16 October 2019
Accepted: 17 June 2020
First Online: 23 June 2020
Compliance with ethical standards
:
: The Institutional Ethics Review Board of Tianjin Centers for Disease Control and Prevention approved this study.
: The authors declare that they have no conflict of interest.