Jiang, Weihua http://orcid.org/0000-0003-1962-3948
Kosmatov, Nickolai
Funding for this research was provided by:
the Natural Science Foundation of China (11775169)
the Natural Science Foundation of Hebei Province (A2018208171)
Article History
Received: 20 January 2018
Accepted: 25 April 2018
First Online: 8 May 2018
Competing interests
: The authors declare that none of them have any competing interests in the manuscript.