Cui, J
Yang, Y
Li, H
Leng, Y
Qian, K
Huang, Q
Zhang, C
Lu, Z
Chen, J
Sun, T
Wu, R
Sun, Y
Song, H
Wei, X
Jing, P
Yang, X
Zhang, C
Article History
Received: 15 June 2014
Revised: 19 November 2014
Accepted: 21 November 2014
First Online: 22 December 2014
Change Date: 23 July 2015
Change Type: Correction
Change Details: This article has been corrected since Advance Online Publication and a corrigendum is also printed in this issue.
Competing interests
: The authors declare no conflict of interest.