Funding for this research was provided by:
National Natural Science Foundation of China (81660473)
the Research Grants Council of Hong Kong CUHK (14167017, 14112618)
Text and Data Mining valid from 2020-02-12
Received: 9 November 2019
Accepted: 16 January 2020
First Online: 12 February 2020
Ethics approval and consent to participate
: Not applicable.
: The authors declare that they have no competing interests.