Lu, Shuanglong
Eid, Kamel
Li, Weifeng
Cao, Xueqin
Pan, Yue
Guo, Jun
Wang, Liang
Wang, Hongjing
Gu, Hongwei
Article History
Received: 16 March 2016
Accepted: 27 April 2016
First Online: 17 May 2016
Competing interests
: The authors declare no competing financial interests.