Funding for this research was provided by:
National Natural Science Foundation of China (81703896, 81673776)
National Key Research and Development Program of China (2017YFC0108102)
Beijing municipal science and technology commission (Z171100001017209)
Text and Data Mining valid from 2019-08-29
Received: 7 May 2019
Accepted: 19 August 2019
First Online: 29 August 2019
: This study dealt with published data only; no ethical approval was needed.
: Not applicable.
: The authors declare that they have no competing interests.