Lin, Duo
Pan, Jianji
Huang, Hao
Chen, Guannan
Qiu, Sufang
Shi, Hong
Chen, Weiwei
Yu, Yun
Feng, Shangyuan
Chen, Rong
Article History
Received: 23 December 2013
Accepted: 4 April 2014
First Online: 23 April 2014
Competing interests
: The authors declare no competing financial interests.