Peng, C
Zeng, W
Su, J
Kuang, Y
He, Y
Zhao, S
Zhang, J
Ma, W
Bode, A M
Dong, Z
Chen, X
Article History
Received: 27 August 2014
Revised: 3 February 2015
Accepted: 11 March 2015
First Online: 1 June 2015
Competing interests
: The authors declare no conflict of interest.