Lu, Guangyuan
Wu, Tianru
Yuan, Qinghong
Wang, Huishan
Wang, Haomin
Ding, Feng
Xie, Xiaoming
Jiang, Mianheng
Article History
Received: 14 July 2014
Accepted: 22 December 2014
First Online: 21 January 2015
Competing interests
: The authors declare no competing financial interests.