Zhang, Yu
zhu, Longbiao
Wang, Ruixia
Miao, Limin
Jiang, Hongbing
Yuan, Hua
Ma, Hongxia
Chen, Ning
Article History
Received: 3 October 2014
Accepted: 21 November 2014
First Online: 11 December 2014
Competing interests
: The authors declare no competing financial interests.