Liang, Jiabei
Jiang, Chao
Peng, Huasheng
Shi, Qinghua
Guo, Xiang
Yuan, Yuan
Huang, Luqi
Article History
Received: 22 August 2014
Accepted: 24 December 2014
First Online: 23 January 2015
Competing interests
: The authors declare no competing financial interests.