Xu, Xiang-Hong
Huang, Xue-Wen
Qun, Li
Li, Ya-Nan
Wang, Yi
Liu, Chao
Ma, Yanyun
Liu, Qing-Mei
Sun, Kang
Qian, Feng
Jin, Li
Wang, Jiucun
Article History
Received: 31 July 2014
Accepted: 24 November 2014
First Online: 12 December 2014
Competing interests
: The authors declare no competing financial interests.