Li, Jia
Liu, Fei
Wang, Qi
Ge, Pupu
Woo, Patrick C. Y.
Yan, Jinghua
Zhao, Yanlin
Gao, George F.
Liu, Cui Hua
Liu, Changting
Article History
Received: 4 June 2014
Accepted: 7 August 2014
First Online: 28 August 2014
Competing interests
: The authors declare no competing financial interests.