Cai, Xi
Han, Guang
Song, Xin
Wang, Jinkuan
Funding for this research was provided by:
National Natural Science Foundation of China (61601108, 61701098, 61374097, 61473066)
Fundamental Research Funds for the Central Universities (N130423006, N130423005)
Natural Science Foundation of Hebei Province (F2012501001)
Foundation of Northeastern University at Qinhuangdao (XNK201403)
Article History
Received: 31 December 2015
Accepted: 21 April 2018
First Online: 30 April 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.