Funding for this research was provided by:
The Fundamental Research Funds in Heilongjiang Provincial Universities (135309506, 135309505)
The Fundamental Research Funds in Heilongjiang Provincial Universities (135209241, 135109242)
Heilongjiang Province Natural Science Foundation (F2017028)
China Natural Science Foundation (61672304)
The Fundamental Research Funds in Heilongjiang Provincial Universities (135309372)
Article History
Received: 28 August 2018
Accepted: 14 June 2019
First Online: 26 June 2019
Compliance with ethical standards
:
: The authors declare that there are no conflicts of interest regarding the publication of this paper.