Xiang, D
Liu, C-C
Wang, M-J
Li, J-X
Chen, F
Yao, H
Yu, B
Lu, L
Borjigin, U
Chen, Y-X
Zhong, L
Wangensteen, K J
He, Z-Y
Wang, X
Hu, Y-P
Article History
Received: 8 January 2014
Revised: 3 April 2014
Accepted: 14 April 2014
First Online: 22 May 2014
Competing interests
: The authors declare no conflict of interest.