Duan, Cuimi
Yang, Xiqin
Zhang, Xuhui
Feng, Jiannan
Liu, Zhiqiang
Que, Haiping
Johnson, Heather
Zhao, Yanfeng
Fan, Yawen
Lu, Yinglin
Zhang, Heqiu
Huang, Yan
Xiu, Bingshui
Feng, Xiaoyan
Article History
Received: 4 February 2015
Accepted: 16 July 2015
First Online: 14 August 2015
Competing interests
: The authors declare no competing financial interests.