Funding for this research was provided by:
Beijing Municipal Natural Science Foundation (7164288)
National Natural Science Foundation of China (81371854, 81373053, 81673237)
national key program for infectious disease of China (AWS15J006, AWS16J020)
Text and Data Mining valid from 2018-07-03
Received: 1 January 2018
Accepted: 25 June 2018
First Online: 3 July 2018
Ethics approval and consent to participate
: The study was approved and authorized by the institutional ethics committees of Academy of Military Medical Sciences of the Chinese People’s Liberation Army, Beijing, China. The institutional review board of the Academy of Military Medical Sciences waived the need for written informed consent from the participants.
: Not applicable.
: The authors declare that they have no competing interests.
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