Funding for this research was provided by:
National Natural Science Foundation of China (71671189, 71431006)
Text and Data Mining valid from 2018-07-16
First Online: 16 July 2018
Compliance with ethical standards
: We declare that we have no financial and personal relationships with other people or organizations that can inappropriately influence our work, there is no professional or other personal interest of any nature or kind in any product, service and/or company that could be construed as influencing the position presented in, or the review of, the manuscript entitled.
: This article does not contain any studies with animals performed by any of the authors.