Funding for this research was provided by:
National Natural Science Foundation of China (51572160)
Natural Science Foundation of Shaanxi Province (2016JQ5083)
Natural Science Foundation of Shaanxi Province (2017KJXX-44)
China Postdoctoral Science Foundation (2015M572516)
China Postdoctoral Science Foundation (2016T90881)
Graduate Innovation Fund of Shaanxi University of Science and Technology
Article History
Received: 4 February 2018
Accepted: 16 March 2018
First Online: 20 March 2018
Compliance with ethical standards
:
: We declare that we do not have any commercial or associative interest that represents a conflict of interest in connection with the work submitted.