Hao, Pan-Pan
Jiang, Fan
Chen, Yu-Guo
Yang, Jianmin
Zhang, Kai
Zhang, Ming-Xiang
Zhang, Cheng
Zhao, Yu-Xia
Zhang, Yun
Article History
First Online: 11 November 2014
Change Date: 2 April 2015
Change Type: Correction
Change Details: In the version of this article initially published online and in print, reference 26 was incorrect. The error has been corrected in the HTML and PDF versions of the article.
Competing interests
: The authors declare no competing financial interests.