Kang, Dongdong
Sun, Huayang
Dai, Jiayu
Chen, Wenbo
Zhao, Zengxiu
Hou, Yong
Zeng, Jiaolong
Yuan, Jianmin
Article History
Received: 16 April 2014
Accepted: 11 June 2014
First Online: 27 June 2014
Competing interests
: The authors declare no competing financial interests.