Funding for this research was provided by:
National Natural Science Foundation of China (71601072)
Text and Data Mining valid from 2020-01-10
Received: 3 August 2019
Accepted: 17 December 2019
First Online: 10 January 2020
Ethics approval and consent to participate
: FFL, ZHB, SWY and YX contributed to each part of this study equally and declare that they have no competing interests.
: FL, ZHB, SWY and YX declare that they have no competing interests.
: FFL, ZHB, SWY and YX read and approved the final version of the manuscript.