Liu, Yue-Ping
Wu, Hai-Yan
Yang, Xiang
Xu, Han-Qing
Chen, Dong
Huang, Qing
Fu, Wei-Ling
Article History
Received: 4 June 2014
Accepted: 27 November 2014
First Online: 17 December 2014
Competing interests
: The authors declare no competing financial interests.