Yao, J
Zhang, L
Hu, L
Guo, B
Hu, X
Borjigin, U
Wei, Z
Chen, Y
Lv, M
Lau, J T Y
Wang, X
Li, G
Hu, Y-P
Article History
Received: 12 March 2016
Revised: 27 May 2016
Accepted: 1 June 2016
First Online: 28 July 2016
Competing interests
: The authors declare no conflict of interest.