Cheng, Jun
Sun, Yan-Ni
Zhang, Can-You
Yu, Yan-Ling
Tang, Li-Hong
Peng, Hong
Peng, Ying
Yao, Yu-Xia
Hou, Shuang-Yi
Li, Jian-Wei
Zhao, Jin-Ming
Xia, Lan
Xu, Lin
Xia, Yin-Yin
Zhao, Fei
Wang, Li-Xia
Zhang, Hui
Funding for this research was provided by:
The National Twelfth Five-year Mega-Scientific Projects of infectious diseases of China (2013ZX10003004-001)
Article History
Received: 13 June 2019
Accepted: 9 December 2019
First Online: 31 January 2020
Ethics approval and consent to participate
: The study protocol was approved by the Research Ethics Review Committee of Chinese Center for Disease Control and Prevention (Approval number: 201322). The signed informed consent was obtained from all participants before investigation.
: Not applicable.
: The authors declare that they have no competing interests.