Zhang, Jing
Wang, Chen
Yu, Shuchun
Luo, Zhenzhong
Chen, Yong
Liu, Qin
Hua, Fuzhou
Xu, Guohai
Yu, Peng
Article History
Received: 8 August 2014
Accepted: 17 November 2014
First Online: 4 December 2014
Competing interests
: The authors declare no competing financial interests.