Funding for this research was provided by:
China Postdoctoral Science Foundation (2013M541372)
Heilongjiang Postdoctoral Fund (LBH-Z13086)
The Fundamental Research Funds for the Central Universities (HIT. NSRIF. 2015047)
Article History
Received: 28 May 2018
Accepted: 10 August 2018
First Online: 14 August 2018
Compliance with ethical standards
:
: There are no conflicts of interest to declare.