Li, Q
Peng, H
Fan, H
Zou, X
Liu, Q
Zhang, Y
Xu, H
Chu, Y
Wang, C
Ayyanathan, K
Rauscher, F J
Zhang, K
Hou, Z
Article History
Received: 12 December 2014
Revised: 18 May 2015
Accepted: 20 May 2015
First Online: 26 June 2015
Competing interests
: The authors declare no conflict of interest.