Ling, Zongxin
Liu, Xia
Jia, Xiaoyun
Cheng, Yiwen
Luo, Yueqiu
Yuan, Li
Wang, Yuezhu
Zhao, Chunna
Guo, Shu
Li, Lanjuan
Xu, Xiwei
Xiang, Charlie
Article History
Received: 8 August 2014
Accepted: 27 November 2014
First Online: 15 December 2014
Competing interests
: The authors declare no competing financial interests.