Long, Jinyi
Huang, Xiaoqi
Liao, Yi
Hu, Xinyu
Hu, Junmei
Lui, Su
Zhang, Rui
Li, Yuanqing
Gong, Qiyong
Article History
Received: 2 April 2014
Accepted: 26 August 2014
First Online: 19 September 2014
Competing interests
: The authors declare no competing financial interests.