Qian, D
Zhang, B
Zeng, X-L
Le Blanc, J M
Guo, Y-H
Xue, C
Jiang, C
Wang, H-H
Zhao, T-S
Meng, M-B
Zhao, L-J
Hao, J-H
Wang, P
Xie, D
Lu, B
Yuan, Z-Y
Article History
Received: 27 June 2014
Revised: 26 August 2014
Accepted: 28 August 2014
First Online: 16 October 2014
Competing interests
: The authors declare no conflict of interest.