Song, Peng
Zhu, Haixia
Zhang, Dong
Chu, Haiyan
Wu, Dongmei
Kang, Meiyun
Wang, Meilin
Gong, Weida
Zhou, Jianwei
Zhang, Zhengdong
Zhao, Qinghong
Article History
Received: 2 July 2014
Accepted: 30 October 2014
First Online: 17 November 2014
Competing interests
: The authors declare no competing financial interests.