Xiaokaiti, Yilixiati
Wu, Haoming
Chen, Ya
Yang, Haopeng
Duan, Jianhui
Li, Xin
Pan, Yan
Tie, Lu
Zhang, Liangren
Li, Xuejun
Article History
Received: 12 November 2014
Accepted: 18 May 2015
First Online: 16 July 2015
Competing interests
: The authors declare no competing financial interests.