Funding for this research was provided by:
National Natural Science Foundation of China (31401014, 31672671, 31372545)
Natural Science Foundation of Yunnan Province (2015FB177)
Innovation Scientists and Technicians Troop Construction Projects of Henan Province
Program for Innovative Research Team (in Science and Technology) in University of Henan Province (14IRTSTHN013)
the PhD Start-up Fund of Henan Normal University (qd15187)
Text and Data Mining valid from 2018-04-11
Received: 25 September 2016
Accepted: 3 April 2018
First Online: 11 April 2018
Ethics approval and consent to participate
: Not applicable.
: The authors declare that they have no competing interests.
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