Funding for this research was provided by:
National Basic Research Program of China (973 Program) (Grant No. 2017YFE0191500)
Macau Science and Technology Development Fund (Grant No. 071/2017/A2)
Text and Data Mining valid from 2019-11-29
Received: 30 August 2019
Accepted: 7 November 2019
First Online: 29 November 2019
Consent for publication
: Not applicable.
: The authors declare that they have no competing interests.