Wang, L
Liu, S
Zhao, Y
Liu, D
Liu, Y
Chen, C
Karray, S
Shi, S
Jin, Y
Article History
Received: 29 October 2014
Revised: 5 January 2015
Accepted: 19 January 2015
First Online: 6 March 2015
Competing interests
: The authors declare no conflict of interest.