Funding for this research was provided by:
the National Natural Science Foundation of China (61366008 and 61664007)
Heilongjiang Provincial Department of Education Filing Project & Mudanjiang Normal University Scientific Research General Project (1352MSYYB001)
the Youth Science Foundation of Heilongjiang Province (QC2016007)
Article History
Received: 2 December 2017
Accepted: 8 January 2018
First Online: 16 January 2018