Xu, Q
Deng, F
Xing, Z
Wu, Z
Cen, B
Xu, S
Zhao, Z
Nepomuceno, R
Bhuiyan, M I H
Sun, D
Wang, Q J
Ji, A
Article History
Received: 15 October 2015
Revised: 19 February 2016
Accepted: 23 February 2016
First Online: 31 March 2016
Competing interests
: The authors declare no conflict of interest.