Funding for this research was provided by:
National Basic Research Program of China (973 Program) (2018YFD1000200)
National Natural Science Foundation of China (31272122)
Text and Data Mining valid from 2020-01-06
Received: 3 November 2019
Accepted: 30 December 2019
First Online: 6 January 2020
Ethics approval and consent to participate
: We were complied by the national laws and the ethical approval in this study.
: Not applicable.
: The authors declare that they have no competing interests.