Funding for this research was provided by:
National Natural Science Foundation of China (81371488)
National Key Research and Development Program of China (2016YFC1306700)
National Key Technology Research and Development Program of the Ministry of Science and Technology of China (2015BAI13B01)
Text and Data Mining valid from 2018-08-25
First Online: 25 August 2018
Compliance with ethical standards
: All authors declare that they have no conflicts of interest.