Wei, Pengfei
Liu, Nan
Zhang, Zhijian
Liu, Xuemei
Tang, Yongqiang
He, Xiaobin
Wu, Bifeng
Zhou, Zheng
Liu, Yaohan
Li, Juan
Zhang, Yi
Zhou, Xuanyi
Xu, Lin
Chen, Lin
Bi, Guoqiang
Hu, Xintian
Xu, Fuqiang
Wang, Liping
Article History
Received: 24 November 2014
Accepted: 24 February 2015
First Online: 9 April 2015
Change Date: 21 August 2015
Change Type: Update
Change Details: A correction has been published and is appended to both the HTML and PDF versions of this paper. The error has not been fixed in the paper.
Competing interests
: The authors declare no competing financial interests.