Hou, Y
Wang, X
Li, L
Fan, R
Chen, J
Zhu, T
Li, W
Jiang, Y
Mittal, N
Wu, W
Peace, D
Qian, Z
Article History
Received: 6 April 2014
Revised: 16 July 2014
Accepted: 20 August 2014
First Online: 2 September 2014
Competing interests
: The authors declare no conflict of interest.