Wang, Gangqi
Ji, Yuan
Li, Zhuang
Han, Xiaolei
Guo, Nannan
Song, Qi
Quan, Longquan
Wang, Tiedong
Han, Wenyu
Pang, Daxin
Ouyang, Hongsheng
Tang, Xiaochun
Article History
Received: 15 November 2013
Accepted: 11 April 2014
First Online: 9 May 2014
Competing interests
: The authors declare no competing financial interests.