Li, Bin
Huang, Guiqin
Sun, Jian
Xing, Zhongwen
Article History
Received: 13 March 2014
Accepted: 19 August 2014
First Online: 22 September 2014
Change Date: 25 June 2015
Change Type: Update
Change Details: A correction has been published and is appended to both the HTML and PDF versions of this paper. The error has been fixed in the paper.
Competing interests
: The authors declare no competing financial interests.