Li, Bingjuan
Li, Yuxia
Bai, Dongmei
Zhang, Xin
Yang, Huiying
Wang, Jie
Liu, Gang
Yue, Juejie
Ling, Yan
Zhou, Dongsheng
Chen, Huipeng
Article History
Received: 7 July 2014
Accepted: 2 October 2014
First Online: 24 October 2014
Competing interests
: The authors declare no competing financial interests.