Huang, Q-X
Cui, J-Y
Ma, H
Jia, X-M
Huang, F-L
Jiang, L-X
Article History
Received: 20 August 2015
Revised: 19 November 2015
Accepted: 23 November 2015
First Online: 18 December 2015
Competing interests
: The authors declare no conflict of interest.