Funding for this research was provided by:
National High Technology Research and Development Program of China (2012AA10A305)
Science and Technology Support Program of China (2011BAD35B01)
Text and Data Mining valid from 2015-09-29
Received: 17 May 2015
Accepted: 18 September 2015
First Online: 29 September 2015
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with animals performed by any of the authors.