Funding for this research was provided by:
Fundamental Research Funds for the Central Universities (2572014EB02-03)
Heilongjiang Postdoctoral Financial Assistance (LBH-Z13001)
National Natural Science Foundation of China (31400497)
General Financial Grant from the China Postdoctoral Science Foundation (2014M561311)
Natural Science Foundation of Heilongjiang Province (LC201406)