Liu, Nannan
Li, Chunhua
Huang, Yan
Yi, Ying
Bo, Wanlan
Li, Chunmiao
Li, Yue
Hu, Yongfei
Li, Kongning
Wang, Hong
Zhuang, Liwei
Fan, Huihui
Wang, Dong
Article History
Received: 8 July 2015
Accepted: 23 September 2015
First Online: 22 October 2015
Competing interests
: The authors declare no competing financial interests.