Liu, Baiquan
Wang, Lei
Xu, Miao
Tao, Hong
Zou, Jianhua
Gao, Dongyu
Lan, Linfeng
Ning, Honglong
Peng, Junbiao
Cao, Yong
Article History
Received: 12 August 2014
Accepted: 5 November 2014
First Online: 26 November 2014
Competing interests
: The authors declare no competing financial interests.