Chen, J
Lan, T
Zhang, W
Dong, L
Kang, N
Zhang, S
Fu, M
Liu, B
Liu, K
Zhang, C
Hou, J
Zhan, Q
Article History
Received: 9 June 2014
Revised: 16 October 2014
Accepted: 8 November 2014
First Online: 2 February 2015
Competing interests
: The authors declare no conflict of interest.