Funding for this research was provided by:
Young Scientists Fund (61100048)
National Natural Science Foundation of China (61370222)
Natural Science Foundation of Heilongjiang Province (F2016034)
Text and Data Mining valid from 2019-04-05
Received: 11 September 2018
Accepted: 28 February 2019
First Online: 5 April 2019
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.