Yao, Yao
Liu, Gordon
Wang, Linhong
Zhao, Hanqing
Zhao, Zhenping
Zhang, Mei
Wang, Meijiao http://orcid.org/0000-0002-0514-7891
Wang, Limin
Funding for this research was provided by:
Bureau of Disease Prevention and Control of National Health Commission of the People's Republic of China
Article History
Received: 2 January 2019
Accepted: 21 May 2019
First Online: 11 June 2019
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: The authors declare that they have no competing interests.