Funding for this research was provided by:
earmarked fund for China Agriculture Research System from the Ministry of Agriculture of China (CARS-36)
Text and Data Mining valid from 2018-11-07
Received: 8 March 2018
Accepted: 10 October 2018
First Online: 7 November 2018
Ethics approval and consent to participate
: Not applicable
: Not applicable.
: The authors declare that they have no conflict of interest
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.