Funding for this research was provided by:
National Natural Science Foundation of China (No. 31671620)
National Key Research and Development Program of China (No. 2016YFD0300210)
Text and Data Mining valid from 2018-12-19
Received: 28 November 2017
Accepted: 7 December 2018
First Online: 19 December 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The corresponding author on behalf of all coauthors, declare no competing financial interests.