Ma, X
Meng, Z
Jin, L
Xiao, Z
Wang, X
Tsark, W M
Ding, L
Gu, Y
Zhang, J
Kim, B
He, M
Gan, X
Shively, J E
Yu, H
Xu, R
Huang, W
Article History
Received: 18 October 2016
Revised: 13 December 2016
Accepted: 2 January 2017
First Online: 20 March 2017
Competing interests
: The authors declare no conflict of interest.