Ma, Leilei
Kong, Feijuan
Ge, Hongwei
Liu, Jingquan
Gong, Fangxiao
Xu, Liang
Hu, Bangchuan
Sun, Renhua
Article History
Received: 4 August 2014
Accepted: 29 October 2014
First Online: 17 November 2014
Competing interests
: The authors declare no competing financial interests.