Hu, An
Huang, Jing-Juan
Li, Rui-Lin
Lu, Zhao-Yang
Duan, Jun-Li
Xu, Wei-Hua
Chen, Xiao-Ping
Fan, Jing-Ping
Article History
Received: 9 April 2015
Accepted: 27 July 2015
First Online: 24 August 2015
Competing interests
: The authors declare no competing financial interests.