Funding for this research was provided by:
National Natural Science Foundation of China (11861027, 11871475)
Natural Science Foundation of Shanghai (51479215, 2016GXNSFAA380194)
Text and Data Mining valid from 2018-11-19
Received: 5 September 2018
Accepted: 8 November 2018
First Online: 19 November 2018
: The authors declare that they have no competing interests in this paper.