Funding for this research was provided by:
National Natural Science Foundation of China (U1609207, 51805474, 51622510)
Science Fund for Creative Research Groups (51521064)
Postdoctoral Research Foundation of China (2017M621915)
Text and Data Mining valid from 2019-02-05
Received: 13 January 2019
Accepted: 23 January 2019
First Online: 5 February 2019
Compliance with ethical standards
: Q.G, P.Z, R.Z, P.W, J.F and Y.H declare that they have no conflict of interest.
: This paper does not contain any studies with human or animal subjects performed by any of the authors.