Funding for this research was provided by:
The National Program on Key Research Project of China (2016YFD0500400)
The National Natural Science Foundation of China (31500152)
China Mega-Project for Infectious Disease (2017ZX10104001-004-001)
Text and Data Mining valid from 2018-12-01
Received: 10 July 2018
Accepted: 25 October 2018
First Online: 5 December 2018
Ethics approval and consent to participate
: The study was approved by the Ethical Committee of the National Institute of Viral Disease Control and Prevention, China CDC.
: Not applicable.
: The authors declare that they have no competing interests.