Ding, Defang
Zhang, Yaping
Wang, Jing
Wang, Xufei
Fan, Dunhuang
He, Linfeng
Zhang, Xuxia
Gao, Yun
Li, Qiang
Chen, Honghong
Article History
Received: 24 August 2016
Accepted: 7 November 2016
First Online: 6 December 2016
Competing interests
: The authors declare no competing financial interests.