Wang, Mingyu
Dong, Yanmei
Zhao, Qiushuang
Wang, Fangzhong
Liu, Kuimei
Jiang, Baojie
Fang, Xu
Article History
Received: 22 August 2013
Accepted: 2 October 2014
First Online: 23 October 2014
Competing interests
: The authors declare no competing financial interests.