Liu, Lei
Zhou, Jun
Jiang, Dong
Zhuang, Dafang
Mansaray, Lamin R.
Hu, Zhijun
Ji, Zhengbao
Article History
Received: 30 June 2015
Accepted: 2 February 2016
First Online: 25 February 2016
Competing interests
: The authors declare no competing financial interests.