Zhou, S
Liu, L
Li, H
Eilers, G
Kuang, Y
Shi, S
Yan, Z
Li, X
Corson, J M
Meng, F
Zhou, H
Sheng, Q
Fletcher, J A
Ou, W-B
Article History
Received: 16 January 2014
Revised: 20 March 2014
Accepted: 27 March 2014
First Online: 24 April 2014
Competing interests
: The authors declare no conflict of interest.