Funding for this research was provided by:
National Natural Science Foundation of China (31571339, 31371293)
National Institute of Environmental Health Sciences (RO1 ES018948)
National Institute of Allergy and Infectious Diseases (AI062885)
State Scholarship Fund of China Scholarship Council (201706625004)
Article History
Received: 14 May 2018
Revised: 11 July 2018
Accepted: 19 July 2018
First Online: 24 July 2018
Compliance with ethical standards
:
: The authors declare no conflict of interest.