Duan, Peng
Hu, Chunhui
Quan, Chao
Yi, Xianfu
Zhou, Wei
Yuan, Meng
Yu, Tingting
Kourouma, Ansoumane
Yang, Kedi
Article History
Received: 21 November 2014
Accepted: 21 October 2015
First Online: 19 November 2015
Competing interests
: The authors declare no competing financial interests.