Liu, Xianghong
Si, Wenping
Zhang, Jun
Sun, Xiaolei
Deng, Junwen
Baunack, Stefan
Oswald, Steffen
Liu, Lifeng
Yan, Chenglin
Schmidt, Oliver G.
Article History
Received: 10 June 2014
Accepted: 21 November 2014
First Online: 12 December 2014
Competing interests
: The authors declare no competing financial interests.