Kang, Bin
Cheng, Shimeng
Peng, Jinbiao
Yan, Jingjing
Zhang, Shuye
Article History
Received: 18 June 2014
Revised: 11 December 2014
Accepted: 19 December 2014
First Online: 28 January 2015
Competing interests
: The authors declare no conflict of interest.