Funding for this research was provided by:
National Key Research and Development Program of China (2016YFD0101500, 2016YFD0101504)
National Hightech R and D Program of China (2011AA10A105)
Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT13073)
Text and Data Mining valid from 2019-01-01
Received: 10 September 2018
Accepted: 16 December 2018
First Online: 2 January 2019
Compliance with ethical standards
: All the authors declare that they do not have conflict of interest.
: This article does not contain any study with human subjects or animals performed by any of the authors.