Xu, Bing
Li, Xiaowei
Yin, Jipeng
Liang, Cong
Liu, Lijuan
Qiu, Zhaoyan
Yao, Liping
Nie, Yongzhan
Wang, Jing
Wu, Kaichun
Article History
Received: 27 October 2014
Accepted: 28 January 2015
First Online: 3 March 2015
Competing interests
: The authors declare no competing financial interests.