Funding for this research was provided by:
Science and Technology Facilities Council (ST/P000304/1, ST/M000826/1, ST/L006316/1)
National Natural Science Foundation of China (41774178, 41761134088, 41574165)
Text and Data Mining valid from 2019-08-05
Received: 29 August 2018
Accepted: 18 July 2019
First Online: 5 August 2019
: The authors declare no competing interests.