Liu, Yingguang
Yan, Jie
Dan, Yaru
Funding for this research was provided by:
National Natural Science Foundation of China (51576066, 51301069)
Natural Science Foundation of Hebei Province (E2014502073)
Fundamental Research Funds for the Central Universities (2017MS123)
Article History
Received: 17 May 2018
Accepted: 4 July 2018
First Online: 11 July 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interests.