Jia, Yongmei
Wei, Benmei
Duan, Ruixue
Zhang, Ying
Wang, Boya
Hakeem, Abdul
Liu, Nannan
Ou, Xiaowen
Xu, Shaofang
Chen, Zhifei
Lou, Xiaoding
Xia, Fan
Article History
Received: 28 May 2014
Accepted: 8 July 2014
First Online: 4 August 2014
Competing interests
: The authors declare no competing financial interests.