Funding for this research was provided by:
National Natural Science Foundation of China (61501119)
Fund for the Dongguan Municipal Science and Technology Bureau (2016508140)
Text and Data Mining valid from 2019-02-01
Received: 17 April 2018
Accepted: 16 January 2019
First Online: 1 February 2019
Consent for publication
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.