Funding for this research was provided by:
Natural Science Foundation of China (61472055, U1713213)
Natural Science Foundation of China (U1401252)
National Science & Technology Major Project (2016Y FC1000307-3)
Chongqing Research Program of Application Foundation and Advanced Technology (cstc2014jcyjjq40001)
Article History
Received: 29 March 2018
Revised: 22 June 2018
Accepted: 4 July 2018
First Online: 13 July 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.