Li, Menghui
Guan, Shuguang
Wu, Chensheng
Gong, Xiaofeng
Li, Kun
Wu, Jinshan
Di, Zengru
Lai, Choy-Heng
Article History
Received: 27 September 2013
Accepted: 11 April 2014
First Online: 6 May 2014
Competing interests
: The authors declare no competing financial interests.