Liu, Huiqiang
Ji, Xuewen
Sun, Li
Xiao, Tiqiao
Xie, Honglan
Fu, Yanan
Zhao, Yuan
Liu, Wenya
Zhang, Xueliang
Lin, Renyong
Article History
Received: 2 August 2016
Accepted: 3 November 2016
First Online: 29 November 2016
Competing interests
: The authors declare no competing financial interests.