Peng, Y
Chen, X
Liu, Q
Zhang, X
Huang, K
Liu, L
Li, H
Zhou, M
Huang, F
Fan, Z
Sun, J
Liu, Q
Ke, M
Li, X
Zhang, Q
Xiang, A P
Article History
Received: 16 January 2014
Revised: 30 May 2014
Accepted: 30 June 2014
First Online: 18 July 2014
Competing interests
: The authors declare no conflict of interest.