Li, Junqiang
Mei, Zengxia
Liu, Lishu
Liang, Huili
Azarov, Alexander
Kuznetsov, Andrej
Liu, Yaoping
Ji, Ailing
Meng, Qingbo
Du, Xiaolong
Article History
Received: 1 August 2014
Accepted: 7 November 2014
First Online: 28 November 2014
Competing interests
: The authors declare no competing financial interests.